This factory manufactured 28" plain barrel with a fixed full choke and a bright, very good bore is for the Sears, Roebuck & Co. model 200 slide action shotgun in 12 gauge with a 2 3/4" chamber. The overall condition is very good retaining most of its original blue finish with a few specks of light surface rust and honest wear.  (file photos)

Note: Firearms with the following serial numbers in 12 gauge with a 2 3/4" chamber have been found with this part: P186835.