This Remington manufactured black finished breech bolt assembly is for the model 870 Express slide action shotgun in 12 gauge and is in very good condition with light wear. The breech bolt assembly consists of the firing pin assembly, extractor assembly and the locking block.  (file photo)

Note: Remington model 870 Express slide action shotguns with the following serial numbers have been found with this part:

A Prefix: A253535M

B Prefix: B466464M, B517355M & B624338M

C Prefix: C021120M

W Prefix: W742320M