Colt Defense M4 Carbine 5.56 NATO AR-15 with Daniel Defense M4A1 FSP RIS II Quad Rail – Used

The Colt Defense M4 Carbine combines Colt's established AR-15 platform with a premium Daniel Defense M4A1 FSP RIS II quad rail. Chambered in 5.56 NATO, this rifle features a Colt-marked barrel with a 1:7 twist rate, an M4-style collapsible stock, and traditional military-inspired styling. Its Colt Defense Hartford, Connecticut receiver markings and LE-prefix serial number add interest for enthusiasts of Colt's law-enforcement-era carbines.

The standout feature is the Daniel Defense M4A1 FSP RIS II free-floating quad rail, featuring four full-length Picatinny rail surfaces and a distinctive cutout for the fixed A2-style front sight.  Additional features include a flat-top upper receiver, folding rear sight, A2-style flash hider, adjustable stock, and textured pistol grip.

This rifle is offered in used condition, showing visible handling marks, finish wear, and surface scratches on portions of the receiver and furniture. The overall configuration appears complete and includes one Amend2 magazine as pictured. The combination of Colt Defense markings, the 1:7-twist barrel, and the Daniel Defense RIS II rail makes this a noteworthy example of a classic M4-style carbine. Please review all photographs for the exact condition and configuration.

Specifications