this post was submitted on 05 Nov 2025
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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.
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.