Port size makes a HUGE differenc in performance in regards to the pressure curve and powders/ projectiles used. Note I'm not referring to ball issue ammo, I'm talkikng the difference between a fast powder and 40s and slow powder and 90s. Can't work the same.
And its not a moot point due to the extension or buffer, I run a full extension and buffer, and if I ran a standard port with 90jlks I'd have stuck cases and ripped rims constantly...
Jeff
