The new KWA LM4 PTR KR12 Gas Blowback Airsoft Rifle features an aluminum alloy flat top upper receiver, aluminum alloy lower receiver, realistic construction and field stripping. This is a very realistic gun, both in operation and how the gun feels. The gas-recoil on this rifle produces a wonderful kick, and is VERY satisfying. The threading under the flash hider is 14mm CC so you can fit different mock suppressors on the gun. The LM4 series from KWA is a perfect training platform for anyone that uses an AR-based platform. Very popular for police and military training.