My factory MI 16” mid gas .308 runs well with and w/o can with full pressure M80. Long tube w/Armalite spring and light buffer. AGB opened for last round lock back.

My first build has a lot of differences - 18” rifle gas, orange Sprinco in RE10 tube, and heavy Lanco enhanced BCG. I have an H, H1 and H3 buffer on hand. So which do you expect to be optimal? I’ll bring them all to the range when it warms up. I do have tungsten weights if even heavier is needed.

Yes, I could just wait to try them all, but it’s cold, I’m old, and getting cabin fever while my winter projects pout in the safe.