why would you add a longer barrel if you prefer it to shoot under 400 fps ?? to pump less I assume..??
A longer barrel will increase velocity, but I think you'll need more than 2 or 3 pumps to see any real gains.
Hadn't considered that - increased pressure/volume release from the valve is required to get it thru the longer volume of the rifle.I'm ok using the pistol 1377 at 2 pumps indoors.As for an upgraded rifle version - I'm more interested in upgrading for upgrade sake ... not so much for keeping the pumps down to maintain the same velocity as the pistol. Shooting indoors - I will understand if it becomes necessary to upgrade my backstop from four pizza boxes