Best buffer you can buy - KynSHOT AR-15 5.56/.223 Sub-Sonic and 300 Blackout Hydraulic Recoil Buffer

This thing is a game changer. Put it in my 10.5" AR .300 blackout and used a reduced Power Buffer Spring from Sprinco. That combination has not only DEFINITELY reduced felt recoil, but has improved reliability. I've put 500 rounds through it and I haven't had a single issue since. I originally was having some failure-to-feeds and light strikes due to the buffer and spring being a little heavy. Swapped out the H2 buffer with this Kynshot and that reduced Power spring and it's been absolutely perfect.