You're actually right. The "recoil system" or shock absorber amounts to the entire barrel reciprocating upon firing a round. The gas is ported to a "piston" in/on the barrel that causes the entire barrel assembly to recoil nearly 12 inches to eject the spent casing and chamber another round.31stArrival » Today, 7:58 am » wrote: ↑ Not anymore than the full sized, with modern tech I am sure that a shock absorber system could be engineered into the stock and/or shoulder pad.