A forearm assembly for a pump action shotgun includes an axially elongated forearm and a pair of action bars. The forward end of each action bar is received and retained within an associated complementary recess in the rear end portion of the forearm. A piston grip comprises part of the forearm assembly and is releasably secured in fixed position to the forearm in a selected one of a plurality of angularly spaced apart mounting positions by a single fastener to accommodate either a right or left handed shooter.
