The MASS is a magazine-fed, straight-pull, bolt-action shotgun that can be used as an underbarrel attachment for the M-16, M-4, and the SCAR series of assault rifles, or used as a standalone weapon with the addition of a snap-on gripstock. (C-MORE has also ...
The bolt action vs lever action faceoff heated up in the late 19th century sporting and military market. Read the blow-by-blow account through the decades.