Our Model M18 Recoilless Rifle Replica is non-firing, dimensionally correct with no moving parts and is made of resin and metal. The 57 mm M18 was a shoulder fired or tripod mounted anti-tank weapon used by the U.S. Army in World War II and the Korean War. It makes a great movie prop, reenactment piece or for parade and display use. Measures 5'1" long. Weighs 18 lbs.