General GunTuber thread

[WhoBusTank69]

This one of those 3D printing loons?

Slack-jawed yokel who impressed Mark Serbu by getting kicked off YouTube for welding pipes together and calling them guns.

 

[HumptiDouji]

If someone has some material on the dude, he could maybe be talked about briefly, but I don't recall there was anything particularly fascinating or funny with the guy, he made simple pipeguns, and some people questioned the safety of some of his concepts. I recall he also tried to make some improvised plate carriers by wrapping a bunch of ceramic floor tiles in lots of duct-tape.

If my memory serves, every single gun which RoyalNonesuch made followed the 'slambang' formula, as seen here, also sometimes referred to as a 'Four Winds' for how it's easy to dispose of the four components to obscure/destroy evidence. A pipe with the suitable diameter to fit a shotgun shell is used as the barrel, and then a simple 'receiver' is made from a larger diameter pipe, an end-cap, and whatever which could be used as a firing-pin, then you slam these things together, and it fires.

Using some good seamless drawn steel pipe, this is actually safe to do, as shotgun shells are pretty low pressure, though if you don't have a solid enough grip on the pipes, the rear one can kind of go flying. You can also do this with mediocre pipe, though you'll notice when they start to give, I've heard at least one anecdote of some goon somewhere making one out of PVC pipe, and it killing him.

The Serbu RN-50 is actually quite a lot more sophisticated than anything that RoyalNonsuch ever built, as it has an actual sealed breech, an actual hammer, trigger, safety, and is made with real barrel blanks (with rifling and actual chambers), and is a break-open kind of action. Real components with real machining goes into these things, as opposed to RoyalNonsuch just assembling some basic off the shelf not-firearms items into a firearm, with the occasional use of welding to crudely attach a piece of pipe to use as a pistolgrip.

 

[Pocket Dragoon]

View attachment 2135169

Wouldn't expect anything less than willful ignorance from those tards.

I've seen people speculate that the load which busted the gun must have been in excess of 100,000 PSI, probably double of the normal operating pressure for .50BMG, the RN-50 itself is rated to hold up to as much as 85,000 PSI.

If accurate, I don't know what would've given first in an M2; the barrel, or the bolt & receiver. The bolt lockup & carrier, along with all the metal around it, are pretty fucking stout.

In any case, it would've definitely made the ammo box & loading tray cover unass the gun in a fucking hurry, along with probably launching the barrel downrange.

So.... did KB know those rounds were reloads? I can't seem to remember hearing in any of his videos that he did, or am I being Mandela'd?

 

[HumptiDouji]

They were probably not reloads, as handloading something like SLAPs is apparently not easy to do. Most likely, these cartridges have just been going around, and this was the one which was the most fucked up and had degraded gunpowder.

This was a good post amongst lots of retarded bullshitting:

 

[Cold Root Beer]

If anybody is actually interested in RoyalNonesuch, all his youtube videos have been uploaded to archive.com (spread across 3 different playlists):

Royal Nonesuch Archive : Royal Nonesuch : Free Download, Borrow, and Streaming : Internet Archive

Original uploads by Royal Nonesuch on Youtube.Channel link: https://www.youtube.com/channel/UC3zqcDInk4fMcnmbSV_q4dgSubtitles and original video descriptions...

archive.org

Royal Nonesuch 2 : Royal Nonesuch : Free Download, Borrow, and Streaming : Internet Archive

Previously a secondary channel for the YouTube channel, Royal Nonesuch.As of 2019 all content seems to have been removed by the user and themed for disc golf....

archive.org

Royal Nonesuch : Royal Nonesuch : Free Download, Borrow, and Streaming : Internet Archive

Videos from a deleted YouTube channel called Royal Nonesuch Show.https://www.youtube.com/user/royalnonesuchshow

archive.org

Honestly, beyond the obvious retard shit like using iphone earbuds as earpro, the sketchiest shit he did was probably the homemade flamethrower that actively leaked fuel and burned all over the nozzle and torch (which he had to put out after firing). Here's him trying to put out the fire by just blowing on it:


Not the brightest bulb, by far.

I do find it pretty funny how Serbu is trying playing down RoyalNonesuch's involvement in the RN-50 development, when the gun is named after him (RN = RoyalNonesuch).

 

[Trig.Point]

They were probably not reloads, as handloading something like SLAPs is apparently not easy to do.

Maybe that's the answer? If the projectile got damaged while it was being fitted to the case. Handload + SABOT + Muzzle break + lighweight rifle = .....

I'm no expert but sometimes when any piece of machinery goes catastrophically wrong, there's not just one cause.

 

[Pocket Dragoon]

Maybe that's the answer? If the projectile got damaged while it was being fitted to the case. Handload + SABOT + Muzzle break + lighweight rifle = .....

I'm no expert but sometimes when any piece of machinery goes catastrophically wrong, there's not just one cause.

I've tried to game out a way in which some SLAP rounds would've been handloaded; the only way I can think of is if someone got their hands on a box of the projectiles alone.... which would be nuts, like a unicorn find, and would probably be worth far more than loaded rounds.

I can't think of any other reason someone would pull & reload complete SLAP rounds, but Bubba has his ways.

The only equivalent method I can think of that'd cause a grenade-like explosion, is a case almost full of powder; or a projectile that's been set back too far, on a hot charge to begin with.

It'll be really interesting to see if KB and Serbu release an AAR and autopsy.... Though it wouldn't silence reddit fags salivating over an opportunity to bag on a guntuber and Serbu, for letting a banned autistic guntuber "design" the RN-50.

 

[Uranus Pink]

Someone asked me if it would be possible for him to 'save his skin' by offering people the option to trade in their RN-50 rifles in exchange for an equivalent value discount on a BFG-50. Some people might appreciate that gesture a lot, but I'm not sure that's economically feasible for him to do.

First as already mentioned an AAR and autopsy needs to be done ASAP on the gun to be as best as legally possible to determine it was only the ammo and user for using iffy ammo is at fault. If something is found wrong however miniscule he is legally liable if anyone else get hurt using it.

 

[WhoBusTank69]

Not the brightest bulb, by far.

To his credit, he did a lot for people making homemade guns and those afraid of kabooms by firing 3 1/2" Goose loads out of a pipegun multiple times, and with bore obstructions.
Darwin didn't claim him that day(mainly because he hides behind a dumpster with a string) when it eventually did give out, but he essentially showed that even shitty pipeguns are okay as long as the ammunition is factory loaded for its purpose.

 

[SmokeyMcRunFast]

They were probably not reloads, as handloading something like SLAPs is apparently not easy to do. Most likely, these cartridges have just been going around, and this was the one which was the most fucked up and had degraded gunpowder.

This was a good post amongst lots of retarded bullshitting:
View attachment 2135575

FW did make a good point about powder deterioration. There is a reason ammo has lot numbers and expiration dates. I could also see these being QC rejects that got “misplaced”.

First as already mentioned an AAR and autopsy needs to be done ASAP on the gun to be as best as legally possible to determine it was only the ammo and user for using iffy ammo is at fault. If something is found wrong however miniscule he is legally liable if anyone else get hurt using it.

I’m waiting on this to speak to causes. As to the threads I’ve mentioned what I would do to make it safer upthread. But without knowing the thread dimensions and the material used I have no idea as to the strength of them. If someone can DM me that I’ll do the calculations for thread strength.

 

[Cold Root Beer]

Backyard Ballistics gives his take on the situation. Here's the quick points:

-Apparently Backyard Ballistics has the dayjob of investigating gun related crimes and accidents, which is why what he says in the video seems pretty insightful

-He places the fault on an overpressure cartridge rupturing, and causing gas to leak back past where the case is usually sealed, and exerted it's pressure against a much larger surface area of the cap.

-He says that the force stripping off the front threads (but not the back threads) doesn't mean that increasing the number of threads would have prevented the accident, because metal deforms under load, and due to load distribution the front threads will always bear the brunt of the weight (i.e. it could have had 50 instead of 5, and you would still have seen just the front 4 shear off and it go flying). So extra threading length on the cap probably wouldn't have prevented the failure (in his opinion).

-While the failure is solely due to the overpressure ammo, he felt there are some simple improvements to the RN-50 that could be made that would decrease the risk of injury in such catastrophic situations. These include:

1. Add vent holes to the cap so that in the unlikely event of a gas leak, it doesn't increase pressure inside the cap itself.

2. Place a hard cover over the stock or frame, so that in the event of a catastrophic failure the cap and debris would be captured or at least deflected by the cover.

3. Double the weight of the cap. This isn't to increase the strength of the cap, but because the amount of time that the pressure would act on the cap in the event of failure is fixed, which means the amount of momentum is fixed. Because the momentum is fixed, a cap that's double the weight would only reach half the speed, which would mean the kinetic energy would be a 1/4th of what it was. Which would also have meant that the metal ears that snapped off and hit Kentucky in the neck/lungs would have been 0.25x the kinetic energy, which would have likely made his injury much less life threatening than it was.

I don't have much mechanical engineering knowledge, so I don't know how much of this video is broscience, but he seems like he knows what he's talking about (at least to me). The video is only 6 minutes long, so it's worth the watch.

 

[Pocket Dragoon]

I could also see these being QC rejects that got “misplaced”.

I get the feeling we may have a winner, although there's no way to know.

I’m waiting on this to speak to causes. As to the threads I’ve mentioned what I would do to make it safer upthread. But without knowing the thread dimensions and the material used I have no idea as to the strength of them. If someone can DM me that I’ll do the calculations for thread strength.

I wonder if they'd equal out to Serbu's stated numbers, or if he publicly lowballed them to keep people from working loads up to that wall.

 

[HumptiDouji]

Backyard Ballistics gives his take on the situation. Here's the quick points:

 

[SmokeyMcRunFast]

Backyard Ballistics gives his take on the situation. Here's the quick points:

-Apparently Backyard Ballistics has the dayjob of investigating gun related crimes and accidents, which is why what he says in the video seems pretty insightful

-He places the fault on an overpressure cartridge rupturing, and causing gas to leak back past where the case is usually sealed, and exerted it's pressure against a much larger surface area of the cap.

-He says that the force stripping off the front threads (but not the back threads) doesn't mean that increasing the number of threads would have prevented the accident, because metal deforms under load, and due to load distribution the front threads will always bear the brunt of the weight (i.e. it could have had 50 instead of 5, and you would still have seen just the front 4 shear off and it go flying). So extra threading length on the cap probably wouldn't have prevented the failure (in his opinion).

-While the failure is solely due to the overpressure ammo, he felt there are some simple improvements to the RN-50 that could be made that would decrease the risk of injury in such catastrophic situations. These include:

1. Add vent holes to the cap so that in the unlikely event of a gas leak, it doesn't increase pressure inside the cap itself.

2. Place a hard cover over the stock or frame, so that in the event of a catastrophic failure the cap and debris would be captured or at least deflected by the cover.

3. Double the weight of the cap. This isn't to increase the strength of the cap, but because the amount of time that the pressure would act on the cap in the event of failure is fixed, which means the amount of momentum is fixed. Because the momentum is fixed, a cap that's double the weight would only reach half the speed, which would mean the kinetic energy would be a 1/4th of what it was. Which would also have meant that the metal ears that snapped off and hit Kentucky in the neck/lungs would have been 0.25x the kinetic energy, which would have likely made his injury much less life threatening than it was.

I don't have much mechanical engineering knowledge, so I don't know how much of this video is broscience, but he seems like he knows what he's talking about (at least to me). The video is only 6 minutes long, so it's worth the watch.

Spoiler: Mechanical engineering sperging

I am a mechanical engineer and everything he said is true. While the cover does not seem viable, he is correct that many guns don’t have that. While he is right that increasing the mass will lower velocity it will not change the amount of kinetic energy (Force) imparted. It will change the velocity at which it flies backwards. Being in direct contact with the ears the same amount of force will be applied to the ears and they will still break off and fly at the same speeds. Extending the ears the full length of the receiver would give more metal to move an honestly me cause them deform instead of shear off. This would also help with the deflection issue.

I wonder if they'd equal out to Serbu's stated numbers, or if he publicly lowballed them to keep people from working loads up to that wall.

It wouldn’t surprise me. Grade 8 bolts are rated at 150,000 PSI and they have the same thread form.

 

[Pocket Dragoon]

It wouldn’t surprise me. Grade 8 bolts are rated at 150,000 PSI and they have the same thread form.

Forgive my motorpool-level of knowledge, but that'd be the point where the bolt fails, right? And not the threads themselves?

I'm sure there's an equation for figuring that out, but I've wilfully forgotten most of that info.

 

[Panama]

Spoiler: Mechanical engineering sperging

I am a mechanical engineer and everything he said is true. While the cover does not seem viable, he is correct that many guns don’t have that. While he is right that increasing the mass will lower velocity it will not change the amount of kinetic energy (Force) imparted. It will change the velocity at which it flies backwards. Being in direct contact with the ears the same amount of force will be applied to the ears and they will still break off and fly at the same speeds. Extending the ears the full length of the receiver would give more metal to move an honestly me cause them deform instead of shear off. This would also help with the deflection issue.

It wouldn’t surprise me. Grade 8 bolts are rated at 150,000 PSI and they have the same thread form.

The one surprising design choice is the lack of a vent hole. Early smokeless firearms designers figured out pretty quickly that you don’t want the gases from a case failure finding the path of least resistance on its own.

 

[UVB-76]

Forgive my motorpool-level of knowledge, but that'd be the point where the bolt fails, right? And not the threads themselves?

I'm sure there's an equation for figuring that out, but I've wilfully forgotten most of that info.

I'm not sure of the dynamics involved but if the threads are the weak link, I don't think they'll hold long enough to let the case carve its way out of the cap.

 

[TerminalTryHard]

Why am I only now hearing about Backyard Ballistics? His videos are so nerdy and I love it.

 

[Pocket Dragoon]

I'm not sure of the dynamics involved but if the threads are the weak link, I don't think they'll hold long enough to let the case carve its way out of the cap.

I think by that point, it'd just turn receiver into a banana peel.

 

[SmokeyMcRunFast]

Forgive my motorpool-level of knowledge, but that'd be the point where the bolt fails, right? And not the threads themselves?

I'm sure there's an equation for figuring that out, but I've wilfully forgotten most of that info.

Kind of. It’s the load per square in that the bolts can take. The total load a bolt can hold increases with the size of the bolt. On the bigger bolts it tends to be the threads that fail first on the smaller ones the bolt itself will fail first.
There are many equations involved in this and they depend on the thread form, the material used... thread design is an entire subsection of engineering.

I'm not sure of the dynamics involved but if the threads are the weak link, I don't think they'll hold long enough to let the case carve its way out of the cap.

The threads are a failure point. However in the case of a vent hole you are deliberately putting in a failure point that will occur before the threads stripping out. By designing in a known failure point you and can lessen the chances of the failure causing injury.
The specific chain of events would be super high pressure load goes boom. Case ruptures allowing gas to push on the larger surface area of the entire plug. Pressure builds up until threads fail and launch the cap backwards. By putting a vent hole in as soon as the case ruptures the gases will follow the path of least resistance out the vent hole. It may not vent all of the gas but it should vent enough that the pressure does not build up to the point that the cap goes rocketing backwards.

Someone mentioned it already but this is a failure on Serbu’s part. Vent holes have been a common feature on guns since the lat 1800. These were put in because case manufacturing was still iffy and if you had a case with a thin spot on the wall the gas would blow back in the shooters face and possibly launch the bolt. By giving the gas an exit it out of the way of the shooter it would prevent burns from hot gas and prevent pressure from building to the point that the bolt lugs shear.
As I have said before making the ears longer so they go back to the stock would also give them the strength to bend down instead of shear off. This would reduce shrapnel in the event of a catastrophic failure and also act to deflect the cap upwards away from the shooters head.