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The Orca is a custom lower/upper pair, look into things like the Bi-poly, the UbarX, or the SL-15 for standalone lowers that can mate to standard uppers.
I only have experience with the sl-15(hoffman) and the proof defiance, both are incredibly durable, I'm looking to make a bipoly with the a2 stock, it looks though af, so you might want to check it out aswell
Love the defiance, I was a little concerned at how thin it was compared to the bipoly but it works great. You're gonna love bipoly, make sure to do the bushing version. It's plenty strong and much easier.
Yeah the bipoly looks great. I'm gonna look into that version as soon as I get my parts!
My 5.56 is on a Hoffman SL-15 and my 300 Blackout is on a Kaewon Defiance remix. Both have held up extremely well, and I have yet to notice a performance decrease at all in either of them.
Only made the ubar3 x so far, pla+. Seems fine but it's got a 22lr bolt in it. I would have no reservations shooting 5.56 out of it btw.
this post was submitted on 15 Oct 2025
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