Tighter tolerances than my other mil-spec buffer tubes, works great on 10" ar-15 5.56 gas piston sig - Geissele Premium Mil-Spec Buffer Tube Assembly With Super 42, H1

I have a couple of other AR 15 pistols using CMMG buffer tubes, springs, and H3 buffers, and my SBA3 pistol braces rattle around on those buffer tubes. But on this Geissele buffer tube my SBA3 brace fits perfectly - it feels like a precision machine when adjusting the brace position. Yes, this cost me 50% more, so it may not be for everyone. I also likes the screw-tube "fidget-toy" that the spring and buffer come packed in,