Not that there's anything wrong with upgrading the buffer spring, but on a 20" rifle it shouldn't be necessary.
I have an A1 clone built with a CMMG 20", A1 profile, chrome lined, 1:7 twist barrel. CMMG doesn't make those barrels anymore (I built this around 2009). It has a standard rifle spring and rifle buffer, with a semi bolt carrier. It won't function properly with PMC, which isn't surprising. Full-power 5.56mm? No problem. Quality .223 like Gold Dot 64gr? Again, no problem. However, it only locks back on the last round about 50% of the time even with those loads. I wouldn't put a FA bolt carrier in it let alone a higher-powered spring. I suspect the gas port may be a little on the smaller side but I'm okay with that over time. Function is fine with the ammo I use but lock-back would turn some folks off.
11C2P '83-'87
Airborne Infantry
Bookmarks