<P> The Spartan 310 has a walnut stock and fore - end, automatic ejectors, and a ventilated barrel rib . It uses screw - in SPR choke tubes . By default, the bottom barrel fires first, but the shooter can select the top barrel to fire first by pushing the trigger blade forward when the gun is loaded and closed . Opening the action automatically engages the manual safety, which is located on the tang behind the top lever . </P> <P> The SPR310 is the standard model . It has either a nickel - plated or blued receiver . The barrels are 26 or 28 inches long . </P> <P> The SPR310S is the sporting model . It has ported barrels that are 291⁄2 inches in length . </P>

Remington spr 310 12 gauge over under shotgun