This spring kit will significantly reduce the pull needed to cock the gun. Kit uses a recoil buffer to compensate for spring pressure reduction.
Compatible Gun Models: Thompson 1927/28 A1, M1A1
Will work with Blank Ammo (using a blank barrel) and Live Ammo.
Kit includes: 1 Hammer, 1 Firing Pin Spring, 2-Recoil Springs, 1 Urethane Recoil Buffer
Watch our 2 minute installation video: Click here for Video.