The all new KWA LM4C PTR Gas Blowback Gun features an aluminum alloy flat top upper receiver, aluminum alloy lower receiver, realistic construction and field stripping. The LM4C is the shorter version of the M4 carbine. This is a very realistic gun, both in operation and how the gun feels. The 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.