Single-trigger Model SPR 310 shotguns have a single trigger which is used to fire each barrel. Once the trigger is pulled to fire the first barrel, release the trigger. The second barrel is then ready to be fired by pulling the trigger again.
As configured by the factory the Model SPR 310 single-trigger shotgun is preset to fire the bottom barrel on the first shot and then the top barrel on the second shot. Once the shotgun is loaded, you may manually set the shotgun to fire the top barrel first. To select the top barrel, with the safety engaged in the “on” position, point the muzzle in a safe direction and push the trigger forward from the rear until you feel and hear a click. You have now set the shotgun to fire the top barrel on the first shot and the bottom barrel on the second shot. Note: Once you open the action with the top lever, the shotgun automatically returns to its original configuration of firing the bottom barrel first.
When you are pushing the trigger forward to select the top barrel, make sure the safety is “on” and the muzzle is pointed in a safe direction. NEVER use the barrel selector when the safety is in the “off” or “fire” position. Once you have used the trigger to select the top barrel, remove your finger from inside the trigger guard until you are ready to fire.