I'd stick with a regular buffer with a Mid system..
from what I read a 14.5" barrel and Mid and Heavy Buffer = no joy with steel ammo (as it has less umphh)..
if you go 14.5" with Carbine than an H buffer would be OK more than likely..
I run a 16" Carbine with 0 issues thus far with factory Std carbine buffer....
If I ever go Middy I would run the Standard buffer and not an H for the same reason.. the kick won't kill me.. I shoot my 308 AR most days with 100-200 rounds.. now thats got some kick.. :happy:
