Colt LE6940P 5.56mm 16.1" Bbl Piston One Piece Matte Black Upper Receiver Conversion Kit LE6940PCK

The Colt LE6940P Monolithic Piston Upper Receiver Conversion Kit is a complete centerfire upper assembly chambered in 5.56mm NATO, uniquely engineering a short-stroke gas piston system into a monolithic receiver platform. Utilizing Colt's proprietary Advanced Articulating Link Piston (ALP) system, this kit reduces inner receiver stress, heat, and carbon fouling by venting gasses forward at the block. The one-piece monolithic quad-rail handguard is machined from a single aluminum forging to completely free-float the barrel, guaranteeing consistent accuracy and optics zero retention under rigorous field conditions.