The Benjamin Trail NP2 uses Crosman's Nitro Piston 2 gas piston system instead of a traditional steel mainspring. This reduces cocking effort, eliminates spring torque, and extends the lifespan of the powerplant. 177 caliber break-barrel design with a wood stock. Type: Rifle Action: Spring Piston Caliber: 177 Cal Capacity: 1 Year introduced: 2013, USA Weight: 80 oz Overall length: 44.5" Status: Active Intended use: target, hunting, pest-control, backyard