This Remington manufactured third variation complete breech bolt assembly is for the model 11-48 semi-auto shotgun in 16 gauge and is in very good condition with light wear. This assembly consists of the third variation breech bolt with the carrier cut, extractor, extractor plunger, extractor spring, firing pin, firing pin retaining pin, firing pin retractor spring, left & right links, link pin, late variation locking block, locking block pin, and the second variation slide. (file photo)