Discuss anything GunCAD related. If you need help, see /c/help. If you think you're discussing a thing a lot of the time, consider making your own separate community.
Abide by the global rules or be smitten.
Shitty stock image may be changed at moderator discretion.
The bipoly makes no sacrifices on strength, that fixed stock is king as the buffer tower is traditionally a weak point. If you want to run a buffer tube and a collapsible stock, something like the Defiance or SL-15 are more appropriate.
That said, don't sleep on the bipoly. It's 100% my favorite lower and worth building one for yourself.
I guess I'm missing something in the build; I printed the PRS style stock, but how does the buffer get held into it? I don't see a set screw point for capturing the buffer and spring inside the stock assembly.
That's a great question, the bipoly's creator determined that including a hole for a buffer detent would lower strength so there is none, you hold it back while you install the upper.
Like I said, it makes no sacrifices on strength. My pla version is well over a year old with thousands of rounds through it and I'm not the only person with these results. I think he was on a good path with this one.
Worth noting the Mono-Poly also ditched the buffer retainer if you printed the bisected model.
I printed the lower in PA6-CF, guess I’ll have to give it a shot (pun intended). Probably will end up Form-1’d with a 10.5” upper in .300 BLK. Thanks for the tips, I’ll see how she shoots :)
You're gonna love it. I'm gearing up to print it in one piece, no seam like a Monopoly.
You could also print out a UBAR3 lower. It can take a standard buffer tube and it's held in place with a u-bolt so it's pretty strong. You can print it with or without an integrated pistol grip. The integrated grip is definitely stronger but not everyone will like it. https://guncadindex.com/detail/UBAR3-X:1