When the FBI went to the 10mm, or were going to, anyway, they had a real problem: the cocking piece. Remember, the angle of the cocking piece determines the leverage of the rollers unlocking. I had a chance to shoot a real-deal FBI 10mm SMG, and we had a hell of a time rebuilding the bolt assembly. We had to swap from one cocking piece to another (they were made with different angles, for this exact purpose) to ensure we had the correct timing for the ammo we were using. If we had the 40SW 10mm ammo equivalent cocking piece in, and fed it full-house 10mm ammo, the empties would disappear over the berm and into the next zip code. If we had the full-house cocking piece in and fed…
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Firearms News (Digital) - 1 Issue, Volume 75, Issue 9