The T870-1 is a pump shotgun with a 12Ga. internal magazine that chambered for 2 3/4" and 3" shells.
The barrel is fitted with a heat shield on it, and there is a Picatinny rail on the heat shield. There is an adjustable rear sight on the receiver. The stock and fore-end are made of black polymer. There is a delicate molded anti-slip pattern at the PISTOL GRIP which makes it more comfortable to hold.