Remington model 11-A semi-automatic shotgun fitted with a lyman cutts compensator. Designed by John Browning as the first successful auto-loading shotgun in america.  (the first U.S produced auto-loading shotgun staring production around 1905) Operating on a long recoil system where the barrel and bolt recoil backward together when fired. The Cutts Compensator is professionally mounted to the muzzle, this prominent historical accessory features distinctive horizonal gas-venting slots and a threaded outer section designed to hold interchangeable external choke tubes. SN# 327820