Mega Rad Gun Thread

WhoBusTank69 said:
Reduce image size or at least post thumbnails as opposed to full-sized images.
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Okay. I think I figured out how to do that. Apolgies, I am a complete boomer when it comes to tech. Now then, hopefully you can enjoy the Obregon Hermanos 1916 top break in all its glory without clicking view attachment.
 
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My form was approved for the PP bizon SBR (still waiting for the parts to ship from stincusa tho), I ordered the stock and optic. My AR9 build now begins its planning phase. 20030711200-803dc18804-k.jpg
I am thinking of something like this. Colt mags are a must, debating on HK sights but I think I will be using an aimpoint comp m2 unless I find another dot i like. Need a light suggestion I'm not too familiar with surefires or lights in general other than to avoid olights. I want a binary for funsies, if you kiwis have any suggestions for the lower I was mainly looking at this CMMG radial delayed blow back lower but not set in stone. I would prefer to completely build the upper myself. So any suggestions there would be greatly appreciated as-well. I have a NFA AR9 that takes MP5 mags but it kinda sucks ass as the tolerances for the magwell is shit. I had to add tape to every mag I own real german or otherwise. It was a pretty well known problem and NFA might fix it if I send it in but I won't.
 
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Akran said:
My form was approved for the PP bizon SBR (still waiting for the parts to ship from stincusa tho), I ordered the stock and optic. My AR9 build now begins its plan.. if you kiwis have any suggestions for the lower I was mainly looking at this CMMG radial delayed blow back lower but not set in stone. I would prefer to completely build the upper myself. So any suggestions there would be greatly appreciated as-well.
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I ended up building something similar off of the CMMG radial system, if you're wanting to fully build out the upper yourself I would say go for it but the tolerances between where the mag will sit relative to the upper might walk a bit more than you might expect. Tying into that I would actually recommend a basic AR style lower along with a colt magwell conversion, you'll have to shave down and possibly modify the feed ramp but it will mean you won't have to deal with the longer Colt AR-9 style bolt catch which can cause some issues with how long it tends to be. You will probably have to shave down the top of the magazine release as well to make it so it feeds properly, at least on mine I had to shave it down to fit the specific lower it was in so that it wouldn't interfere with the bolt and it wouldn't jam the rounds either into the feed ramp or low enough that it kicked the rounds up while feeding and jammed the JHPs into the top of the chamber locking the gun up.

CMMG isn't joking too much when they don't guarantee that their barrel kits will be drop in, if you've got the cash and are okay not building I would probably recommend just buying one of their pre assembled guns, maybe their dedicated lowers would work better but there might be some unintended slop between their pin locations for the upper and the upper you end up going with so you might have to shave the mag release down a little anyways.

I love mine once I managed to do the small amount of hand fitting required to get it working, although it is a little picky about JHPs so I can't use some of the more open mouthed 147gr rounds, all the FMJs I've tried have worked fine though. Who knows maybe your build will have the tolerances stacking in a way that makes it fit together easier, just go slow if you have to trim it up and have a backup mag catch just in case, ideally something with a little extra slop in the lower's mag catch hole.
 
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