Hi Standard K101 Brush-20 riot gun. 20-inch barrel, 12-gauge/2.75-inch, cylinder bore, rifle sights, factory wood stock. It has a milled steel receiver. Very ergonomic for an older pump, with a slide release and loading port like a Mossberg (no cartridge elevator to get in the way). The barrel is threaded on, so changing it is hard, but reportedly the accuracy with slugs is exceptional. This model was produced from the 1960s to the mid-'70s. Never fired by me, in very good condition. Initials engraved on bottom of pistol grip. $200 SOLD. Images are of same model, but different example.