General GunTuber thread

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Sleazy Car Salesman said:
Maybe, an interrupted thread would definitely help the thing with faster cycling although an interrupted thread would be weaker. I doubt it would be weak enough to make a tremendous difference in overall strength but for faster reloading it would probably be nice.

@Smoke Manmuscle you were talking about engineering and material science earlier in the thread, what do you think?
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I would need to know the threads per inch, the diameter and what the material specs are to do the math but it seems likely. For context a grade 8 bolt you buy in the hardware store is rated to break at 140,000 PSI.

The fact that the 190,000 PSI he had made failed in the same exact manner tends make me lean towards the hot round theory.
 
Nonanalogbeing said:
It's kind of ironic that Deviant Ollam has gotten all woke, and anything sexual in a way that's not in a approved way he finds offensive, but somehow he seems obsessed with sex workers.

Before he went woke, these were on his website.

This is an image that was taken of a presumably drunk girl having group sex in a pool at Defcon. Notice Deviant is taking the picture from behind her and I doubt she knows.

Alternate for above

Here is just some strippers.

More strippers

A few more
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For ages, I didn't want to go to Defcon very much because it's a degenerate frat party. Now it's a trooned out degenerate frat party that you can catch all the good presentations on Youtube anyway.

I don't understand the cognitive dissonance of modern Defcon that Deviant exemplifies here. It's still supposed to be some kind of exponent of tht anarchist "temporary autonomous zone" concept but now you gotta RESPECT MY PRONOUNS and stuff. Like, an event where owning the guy across the lobby's laptop is considered good sport is not, shall we say, respect-based. And yet it's still a bunch of tech bros being bros in some corners. I'm surprised there hasn't been (much of) a purge yet.
 
UVB-76 said:
Because the case is manually inserted and removed, a threaded plug would require threading on the inside, and thus the chamber to be reamed past the threads. The case would be difficult to remove.
With threading on the outside, you essentially require zero loss of "effective action length" and the case extractor groove can sit just a tad off the breach end and make it easier to pry it out.
Obviously with the threaded cap you have the potential for a case head failure to leak gas into the cap, and the wider surface area means more force applied on the threads. With a threaded plug you wouldn't get this area increase.
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A breach plug could have a fixed extractor cut into it that the round needed to be slid into and the whole breach plug plus round would then be threaded into the rifle. I don't think the action length really matters for this type of rifle.

Also, the two 'safety' ears really need to be re-thought. If they had more material connecting them to the lower, say not making the cut on the lower so that the ears start from the rear and end at the breach.
 
I was listening to a stream by 3d printing gun guys and one of the mentioned that BRCC bought a ton of land near San Antonio and that's where Brandon Herrera filmed his Luty video. Most of Texas land is privately owned, so BRCC essentially has a space they can use as leverage over the youtubers who moved there recently and now have an incentive to not talk shit about them. Really activates my almonds.
Fools Idol said:
A breach plug could have a fixed extractor cut into it that the round needed to be slid into and the whole breach plug plus round would then be threaded into the rifle. I don't think the action length really matters for this type of rifle.

Also, the two 'safety' ears really need to be re-thought. If they had more material connecting them to the lower, say not making the cut on the lower so that the ears start from the rear and end at the breach.
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I could see that working if the fixed extractor was like half the circumference, and maybe had a sliding piece which "guillotines" the whole extractor groove. Like KAC qd mounts. Otherwise any stuck case means having to knock it out from the front.
Even with a fixed extractor in the breach plug it's important to consider that extraction in firearms is sort of a funky science. Some bolt actions and early repeaters have a camming surface that allows the motion on the bolt handle to be transferred into a few millimeters of reward travel with mechanical advantage, so the pull of the bolt back doesn't have to do all the work. It would be great if the back of the breech plug was milled to be a standard size bolt, and using a tool as a breaker bar to spin the plug would also force it rewards due to the threads, pulling the stuck case out.
 
UVB-76 said:
I was listening to a stream by 3d printing gun guys and one of the mentioned that BRCC bought a ton of land near San Antonio and that's where Brandon Herrera filmed his Luty video. Most of Texas land is privately owned, so BRCC essentially has a space they can use as leverage over the youtubers who moved there recently and now have an incentive to not talk shit about them. Really activates my almonds.
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The thing I've been seeing more and more of late across many areas I monitor on here. Someone scrapes together a little bit of success then tries to become the means by which people ply their trade, to either softly or explicitly abuse that.

The idea of "Oh gosh, you need a range without rules to make your content, maybe you shouldn't talk shit about my coffee XD" really gets me too.
 
UVB-76 said:
I was listening to a stream by 3d printing gun guys and one of the mentioned that BRCC bought a ton of land near San Antonio and that's where Brandon Herrera filmed his Luty video. Most of Texas land is privately owned, so BRCC essentially has a space they can use as leverage over the youtubers who moved there recently and now have an incentive to not talk shit about them. Really activates my almonds.

I could see that working if the fixed extractor was like half the circumference, and maybe had a sliding piece which "guillotines" the whole extractor groove. Like KAC qd mounts. Otherwise any stuck case means having to knock it out from the front.
Even with a fixed extractor in the breach plug it's important to consider that extraction in firearms is sort of a funky science. Some bolt actions and early repeaters have a camming surface that allows the motion on the bolt handle to be transferred into a few millimeters of reward travel with mechanical advantage, so the pull of the bolt back doesn't have to do all the work. It would be great if the back of the breech plug was milled to be a standard size bolt, and using a tool as a breaker bar to spin the plug would also force it rewards due to the threads, pulling the stuck case out.
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The funny thing about this is that every improvement I can think of like interrupted threads on a breach plug with a fixed extractor, slowly turns this into a multi lug rotating bolt. Which is a very different type of rifle.

I do think there are modifications to the design that don't involve a whole re-design. Watching the Kentucky ballistics video on the RN50 I noticed that the lower split when the end cap blew and the safety ears breaking off are what nearly killed him the first time. So I think that there should be two steel plates welded to the lower, one towards the rear and one were the two ears are. Making the ears stronger with more material connecting them to the lower is also a no-brainer to me. This would stiffen the lower and help to contain the end cap should it blow off and maybe deflect it should it do so.

Designing the rifle to withstand extremely out of spec rounds is pretty much imposable but the rifle needs to be less dangerous to the user when it does fail. The two biggest concerns I have is the end cap blowing off and the safety ears sharing off, both are coming back into the shooters face when they do so more needs to be done in this area.
 
Fools Idol said:
The funny thing about this is that every improvement I can think of like interrupted threads on a breach plug with a fixed extractor, slowly turns this into a multi lug rotating bolt. Which is a very different type of rifle.

I do think there are modifications to the design that don't involve a whole re-design. Watching the Kentucky ballistics video on the RN50 I noticed that the lower split when the end cap blew and the safety ears breaking off are what nearly killed him the first time. So I think that there should be two steel plates welded to the lower, one towards the rear and one were the two ears are. Making the ears stronger with more material connecting them to the lower is also a no-brainer to me. This would stiffen the lower and help to contain the end cap should it blow off and maybe deflect it should it do so.

Designing the rifle to withstand extremely out of spec rounds is pretty much imposable but the rifle needs to be less dangerous to the user when it does fail. The two biggest concerns I have is the end cap blowing off and the safety ears sharing off, both are coming back into the shooters face when they do so more needs to be done in this area.
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As I understand it, the ears aren't there to hold the cap in case of an off-spec detonation, they're there to ensure the cap is fully threaded in otherwise the gun won't "close" and you can't fire it. As a bonus, if the threads start stretching and the cap can't go forward enough even when threaded in, the ears will also make sure the rifle isn't operational. Their strength should not be relied on as a safety mechanism because they're made out of the same material as rest of the receiver, which is a non-pressure bearing part, and one that also swings on that pivot under the barrel.

So, instead of trying to beef up the ears, I'd go for a U-shape on the receiver that envelops the bottom half of the threaded cap. That would definitely be more material and it would mean you can't just cut the whole receiver out of a single piece of flat metal, but it should increase structural integrity of that area. Another idea is to "invert" the ears. Have a short step that the threaded cap slides into so the barrel only locks into place if the cap is fully threaded, and then the ears slope upwards away from the cap, about twice the distance they go now. The idea here being to try to deflect the cap upwards and away from the shooter's face without shearing the locking ears, because even after shearing the ears off the cap had enough energy to break half of Scott's face. A third idea would be to somehow build the "won't lock if not threaded in" function to the hammer itself and ditch the ears altogether. I'm not sure if that's possible with the mechanism they've got going on there, but it's also an option.

I imagine Serbu thought about most of these things before but decided, for whatever reason, to land on the design he's selling now. I don't know just how hard his destructive testing was, maybe he only worked with 2x overpressure instead of 3x or 4x.
 
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Corn Flakes said:
As I understand it, the ears aren't there to hold the cap in case of an off-spec detonation, they're there to ensure the cap is fully threaded in otherwise the gun won't "close" and you can't fire it. As a bonus, if the threads started stretching and the cap can't go forward enough even when threaded in, the ears will also make sure the rifle isn't operational. Their strength should not be relied on as a safety mechanism because they're made out of the same material as rest of the receiver, which is a non-pressure bearing part, and one that also swings on that pivot under the barrel.

So, instead of trying to beef up the ears, I'd go for a U-shape on the receiver that envelops the bottom half of the threaded cap. That would definitely be more material and it would mean you can't just cut the whole receiver out of a single piece of flat metal, but it should increase structural integrity of that area. Another idea is to "invert" the ears. Have a short step that the threaded cap slides into so the barrel only locks into place if the cap is fully threaded, and then the ears slope upwards away from the cap, about twice the distance they go now. The idea here being to try to deflect the cap upwards and away from the shooter's face without shearing the locking ears, because even after shearing the ears off the cap had enough energy to break half of Scott's face. A third idea would be to somehow build the "won't lock if not threaded in" function to the hammer itself. I'm not sure if that's possible with the mechanism they've got going on there, but it's also an option.

I imagine Serbu thought about most of these things before but decided, for whatever reason, to land on the design he's selling now. I don't know just how hard his destructive testing was.
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That is what the ears are for but the way the design is now any catastrophic failure leads to the end cap and pieces of the lower (namely the ears) shooting straight back into the shooters face. Your U-shape on the lower is sort of what I'm thinking. Having the two ears be connected in the middle by a bock of steel that the end cap sits flush with (kind of like a break action). I do still think that the ears do need to be beefed up though, just to lessen the chance of them shearing off.

Stiffening the two halves on the lower can also be achieved by this welded block which is important because in the second test the ears didn't shear off but two halves of the lower did bend allowing the cap to go straight back.

This wouldn't change the primarily function of the ears but would make them and the lower better able to deal with this type of failure.
 
Fools Idol said:
That is what the ears are for but the way the design is now any catastrophic failure leads to the end cap and pieces of the lower (namely the ears) shooting straight back into the shooters face. Your U-shape on the lower is sort of what I'm thinking. Having the two ears be connected in the middle by a bock of steel that the end cap sits flush with (kind of like a break action). I do still think that the ears do need to be beefed up though, just to lessen the chance of them shearing off.

Stiffening the two halves on the lower can also be achieved by this welded block which is important because in the second test the ears didn't shear off but two halves of the lower did bend allowing the cap to go straight back.

This wouldn't change the primarily function of the ears but would make them and the lower better able to deal with this type of failure.
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My question is always what is the receiver going to do if the cap decides it wants to go somewhere really, really quick. Because I have a feeling that even with that beefed-up breech-locking block we're thinking about, all that's going to happen is the receiver is going to break off at the joint under the barrel and fly backwards as a whole unit.

You can see it on the video itself, the receiver splits in half and breaks off, falling to the ground, while the cap... I think that's what breaks that piece of cinderblock on the top right of the wall. I don't know if it just went in that direction by itself, or if it bounced off something (possibly even the ears). If the receiver were solid enough to retain "control" of the cap as it flies backwards, the worst case scenario would be whole assembly striking/embedding itself into the shooter. Gruesome.
 
Corn Flakes said:
My question is always what is the receiver going to do if the cap decides it wants to go somewhere really, really quick. Because I have a feeling that even with that beefed-up breech-locking block we're thinking about, all that's going to happen is the receiver is going to break off at the joint under the barrel and fly backwards as a whole unit.

You can see it on the video itself, the receiver splits in half and breaks off, falling to the ground, while the cap... I think that's what breaks that piece of cinderblock on the top right of the wall. I don't know if it just went in that direction by itself, or if it bounced off something (possibly even the ears). If the receiver were solid enough to retain "control" of the cap as it flies backwards, the worst case scenario would be whole assembly striking/embedding itself into the shooter. Gruesome.
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I would imagine that we would see more forward movement of the upper. It sounds strange but getting hit by the whole lower might be preferable to being hit by the cap. The most dangerous part of the design is the ears shearing off as they basically turn into shrapnel.
 
Fools Idol said:
I would imagine that we would see more forward movement of the upper. It sounds strange but getting hit by the whole lower might be preferable to being hit by the cap. The most dangerous part of the design is the ears shearing off as they basically turn into shrapnel.
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Good point.

Either way, as much fun as it is to think of these things I have a feeling Scott's little near-death experience will be relegated to "freak accident" and not result in any sort of redesign to the gun. Still, Scott's later testing did show it handled overpressure rounds well enough (I think even a bolt action would have complained about the energy required to emboss the headstamp onto the breech), so I do believe the design is safe. I wouldn't get one myself, but that's more because I while I think firing .50 BMG, is fun, owning a gun in that caliber feels... kinda dumb.
 
I love this goddamn thread, we shitpost and make playground insults at people one moment and then have a bunch of actual discussions about mechanical engineering, literature, and business, as well as politics without totally sperging. Russel is in the thread and unlike most other Persons of Interest he's actually a decent guy and gets along with our retarded asses pretty well. And then when we're done having actual nice conversations we go back to calling youtubers stupid fuckheads again without missing a beat.
 
I just don't feel comfortable with the crappy two-piece receiver. While in the intentional kaboom it separates safely without turning itself into shrapnel that's obviously not consistent. The "wings" are for headspace, sure, but I agree they're very much possible projectiles in the worst case scenario.

Corn Flakes said:
You can see it on the video itself, the receiver splits in half and breaks off, falling to the ground, while the cap... I think that's what breaks that piece of cinderblock on the top right of the wall. I don't know if it just went in that direction by itself, or if it bounced off something (possibly even the ears). If the receiver were solid enough to retain "control" of the cap as it flies backwards, the worst case scenario would be whole assembly striking/embedding itself into the shooter. Gruesome.
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kerpow.png

Object 1 is probably the cap, deflected by dumping energy into and splitting the receiver in half before slamming into the brick.
Object 2 I first thought was the cap, that was the piece that punched through the plexiglass to the side. No clue what it could have been but it's semi-circular.
I'm beginning to doubt my initial assessment because of your observation but with all this considered the entire thing turns into a frag grenade with nothing to even begin to contain it; while it's incredibly resilient, it's got nothing else in case of emergency and KB definitely showed with his first incident that it may be needed.
 
WhoBusTank69 said:
I just don't feel comfortable with the crappy two-piece receiver. While in the intentional kaboom it separates safely without turning itself into shrapnel that's obviously not consistent. The "wings" are for headspace, sure, but I agree they're very much possible projectiles in the worst case scenario.


View attachment 2998620
Object 1 is probably the cap, deflected by dumping energy into and splitting the receiver in half before slamming into the brick.
Object 2 I first thought was the cap, that was the piece that punched through the plexiglass to the side. No clue what it could have been but it's semi-circular.
I'm beginning to doubt my initial assessment because of your observation but with all this considered the entire thing turns into a frag grenade with nothing to even begin to contain it; while it's incredibly resilient, it's got nothing else in case of emergency and KB definitely showed with his first incident that it may be needed.
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Where I come from we'd call something that looked like that a pipebomb.
 
WhoBusTank69 said:
I just don't feel comfortable with the crappy two-piece receiver. While in the intentional kaboom it separates safely without turning itself into shrapnel that's obviously not consistent. The "wings" are for headspace, sure, but I agree they're very much possible projectiles in the worst case scenario.


View attachment 2998620
Object 1 is probably the cap, deflected by dumping energy into and splitting the receiver in half before slamming into the brick.
Object 2 I first thought was the cap, that was the piece that punched through the plexiglass to the side. No clue what it could have been but it's semi-circular.
I'm beginning to doubt my initial assessment because of your observation but with all this considered the entire thing turns into a frag grenade with nothing to even begin to contain it; while it's incredibly resilient, it's got nothing else in case of emergency and KB definitely showed with his first incident that it may be needed.
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This is why I said I want to see tests done with that ridiculously overpressure round in a bolt-action and in a a semi-auto. I'm not denying that the RN-50 is unsafe under these loads. It clearly is. We know that empirically: even if the ears shearing off were a freak accident, it did happen in the real world and we have documentation to prove it. But this whole situation makes me very curious to see how more common actions handle overloads of that caliber.

I've seen plenty of popped guns on the internet, even a couple guns on the range that tried to munch on rounds a little too spicy for their actions (or a squib). But nothing as extreme as what happened to Scott, either in terms of relative or absolute overpressure. So I'd like to see more. Unfortunately, that's never going to happen because those guns are very expensive (one of the reasons why I think owning one is pretty daft). Scott only did this because Serbu sent him a new gun. Barrett Firearms Manufacturing sure as shit aren't sending him a M82 and telling him to go for it and record a whole episode on how he turned their shiny new gun into shrapnel.
 
wopirish said:
Now the real question is where did those counterfeit rounds come from and who has been making them? KB certainly has enough contacts he might be able to get to the bottom of it or find a lead.
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We'll never ever know.
As gone over before, .50 SLAPs are collectible and even genuine ones get passed around as loose singles all over the place, and who knows how well that was stored. What's to say that the group of 20 you buy at some gun show hasn't had its cartridges sourced individually in part or in full at some point, and how each of those were stored? That's before you even get into potential counterfeits, where someone just throws something together to just look right, assuming nobody would shoot these (because most people don't).
Most of the cartridges from that batch exhibited pants-shitting overpressure signs, a few of them behaved completely normally, and one of them had even grenaded a rifle, I think there's no question that these cartridges have not been together as one group throughout the decades, they were not consistent.

People have blown up nice rifles shooting SLAPs in the past, so it's not unprecedented. If there's grenades counterfeits going around, which I think is entirely plausible, whoever actually made them could very well have been dead for 20 years at this point.

Smoke Manmuscle said:
The fact that the 190,000 PSI he had made failed in the same exact manner tends make me lean towards the hot round theory.
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Did it even? The ears deformed rather than shearing off that time, so I figure the pressure of the accident round may have been even more.

Fools Idol said:
Also, the two 'safety' ears really need to be re-thought. If they had more material connecting them to the lower, say not making the cut on the lower so that the ears start from the rear and end at the breach.
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Or people can just not shoot an (expensive) type of .50BMG of generally unclear history and known for catastrophically destroying rifles. You don't see people clamoring for better safety in 9mm Parabellum pistols because there's people out there making 9mm Major loads.

Fools Idol said:
It sounds strange but getting hit by the whole lower might be preferable to being hit by the cap.
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I don't think that's strange, you'd already be supporting the lower with your shoulder and hand, and if it remained in one piece you're looking at way more mass and way more surface area. Not that it wouldn't still lead to injury.

Fools Idol said:
The most dangerous part of the design is the ears shearing off as they basically turn into shrapnel.
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Which Scott couldn't even properly replicate having made a bullshit round with three times the normal operating pressure. The safety margins may be thinner compared to most .50s, but if you buy normal commercial ammo, or if you're a handloader who isn't special needs, the rifle won't endure even close to even a 50% increase in pressure, not to talk about the +300% of the accident.

This entire thing is someone learning the very hard way to not shoot ammo of unclear origin.
 
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HumptiDouji said:
Or people can just not shoot an (expensive) type of .50BMG of generally unclear history and known for catastrophically destroying rifles. You don't see people clamoring for better safety in 9mm Parabellum pistols because there's people out there making 9mm Major loads.
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Tbf, isn't this exactly what happened with Beretta 92s getting redesigned because of a few anecdotal examples of slides launching back into SEALs' faces?
 
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