I am a total AAC .300 Blackout convert! I like the bigger projectile that the Blackout (7.62x34mm) has. True, I still love the 5.56, especially from my 20" barreled SP1/602 Colt clone. BUT... This little .300 Blackout M4 I've built is my FAVORITE long gun, even surpassing my beloved transitional 5.7 mil Winchester
M1
carbine! The .300 just has THUMP! Whether for serious shooting situations, or if I go plinking, the Blackout is my go-to weapon.
With that said, though, my latest acquisition is a .308 - a PTR91 A3S (American made HK 91 clone) VERY nice! Sweet shooter, though not as handy as the .300 Blackout.