How do you determine felt recoil? I understand recoil cannot be reduced with the same cartridge, just using things to reduce the felt recoil. What percentage of recoil does the bolt carrier group hitting the rear receiver wall cause? I would think a lot because the bullet is very fast but weighs only several grams, while the bolt carrier is much slower but is very very heavy compared to the bullet. The rifle in question is an AK type, does anyone have one, perhaps you could weigh the bolt and tell? Thanks, I'd really appreciate it.