tack driver is a relative term for 7.62x39 because of ammo. Mine is an SBR'd M92 PAP (10" barrel) and does everything it needs to @ 100yds. for 10" less of barrel and lose only 400fps, i'll take that all day.
if you don't want to SBR then go 16"...
Edited by NTXBowfisher (03/05/15 10:20 AM)