I'm building an AR 9mm carbine..semi auto What buffer weight would you recommend and why. Here is something from spikes..so it made me wonder which one to buy.
Standard CMT carbine buffer - 2.9 oz.
CMT H buffer - 3.8 oz.
CMT H2 buffer - 4.1 oz.
Armalite H3 buffer - 4.7 oz.
RRA 9mm buffer - 5.5 oz.
ST-X SS 9mm buffer - 6.0 oz.
ST-9X SS Extended 9mm buffer - 8.5 oz.
ST-SST - 7.0 oz.