Colt M4 Carbine 5.56 NATO, 16 inch, 1:7 Twist, Direct Impingement, Flat-Top Picatinny, CR Prefix — Excellent Condition
This Colt M4 Carbine stands out with its CR-prefix lower, Colt Defense rollmarks, and a properly marked, MP-inspected M4-profile barrel. It features a 16 inch 5.56 NATO barrel with a 1:7 twist, a flat-top Picatinny upper, and a carbine-length direct-impingement system. Clear Colt identifiers and proof marks—including CAGE code 13629 and the rampant pony—underscore its authentic commercial M4 lineage.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are light signs of wear and handling with some surface scratches. The rifle is missing the handguard but functions as intended.
What’s Included
- Original box
The receiver set carries correct Colt markings: the lower is rollmarked "M4 CARBINE CAL. 5.56 MM" with the Colt logo, while the right side reads "COLT DEFENSE HARTFORD, CONN. U.S.A." with selector positions SAFE/FIRE. The serial prefix is CR. Additional factory identifiers include the Colt rampant pony and a 2D/QR marking.
The 16 inch M4-profile barrel is stamped "13629 M P 5.56 NATO 1/7," indicating Colt’s CAGE code, magnetic particle inspection, chambering, and twist rate. It uses a carbine-length gas system with a low-profile gas block and a stainless carbine-length gas tube. An A2-pattern birdcage flash suppressor is installed on the threaded muzzle.
The flat-top Picatinny upper provides a continuous top rail and includes a forward assist, case deflector, and ejection-port cover. Operation is semi-automatic with a direct-impingement system. A manual safety controls the SAFE/FIRE selector positions.
Furniture includes a collapsible polymer carbine stock, an enhanced trigger guard, and an A2-pattern pistol grip. The receivers wear a matte black anodized finish. Overall configuration aligns with the Colt commercial M4 Carbine (LE/CR6920 family) profile and the platform is AR-15, made in the United States.