This factory manufactured 28" vent rib barrel with a "Mod" Rem-choke choke tube and a bright, very good bore is for the Remington 870 Express slide action shotgun in 12 gauge with a 2 3/4" or 3" chamber. The overall condition is very good retaining most of its original blue matte finish with a few specks of light surface rust and honest wear.  (file photos)

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

A Prefix: A253535M

B Prefix: B517355M