The Colt LE6940P is a gas-piston variant of the monolithic upper LE6940, featuring a short-stroke piston system in place of direct impingement while retaining the one-piece monolithic upper receiver. The piston system provides reduced receiver fouling and lower bolt carrier temperatures for sustained fire. One of the few major-manufacturer piston ARs with a monolithic upper configuration. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2010, USA Weight: 7.2 oz Overall length: 33.5" Status: Discontinued Intended use: Tactical, Law Enforcement