Patent ID: 7770507

Claim:
A roller delayed blowback action system for a semi-automatic shotgun having a receiver including an ejection port for expelling an empty cartridge of a fired projectile, the roller delayed blowback action system comprising: the receiver including a pair of inserts—a first insert and a second insert—extending within the receiver; a bolt carrier including a third insert, the bolt carrier being operatively attached to a bolt, wherein the bolt and the bolt carrier being movable within the receiver and substantially parallel to a longitudinal axis; a pair of rollers—a first roller and a second roller—positioned rearward of the ejection port, the pair of rollers being substantially contained within the bolt and proximate the third insert, the first roller being proximate the first insert and the third insert and the second roller being proximate the second insert and the third insert, wherein operative cooperation between the pair of rollers and the first, second, and third inserts delays movement of the bolt and bolt carrier subsequent to firing of the shotgun without locking movement of the bolt or the bolt carrier.