This Remington manufactured fourth variation complete breech bolt assembly is for the Sportsman 48 semi-auto shotgun in 12 gauge and is in very good condition with light wear. This assembly consists of the fourth variation breech bolt with carrier cut (no legs), extractor, extractor plunger, extractor spring, late 2 15/16" long firing pin, firing pin retaining pin, firing pin retractor spring, left & right links, link pin, late variation locking block, locking block pin, and the fourth variation slide. (file photos)