Kratos Design Group 8-Position Receiver Extension | A5 Compatible

This tube was provided to me by Kratos, but that in no way affects this review. I compared it to a vltor tube and an fcd tube I have here. I’m no machinist, but dimensionally with a caliper, it’s in line with those two. The threads as far as I can tell are in spec, as I threaded it into an aero, geissele, lmt and old production mega billet receivers I have here. Also used fcd, pws, and a few no name castle nuts. It threaded fine and I didnt distinguish any different feel or play vs the other tubes. The finish is on par with the others as well. It may have been luck of the draw, but this is the best looking extrusion of the bunch. Several stocks, b5, magpul moe slk and ctr, sba3 brace, fit perfectly as well. When assembled, the action feels as smooth as the other tubes with the same buffer and spring(vltor A0 and geissele super 42 rifle length spring). Overall I’m impressed with this part, the rifle ran as it did with the vltor tube on it. A great option for your next build!!!