Colt 5.56 NATO Carbine, Pinned 16.1-Inch Barrel

The Colt 5.56 NATO carbine (brand part no. CR6921-EPR-PW) pairs Colt’s proven AR-15 platform with a 14.5-inch barrel that Colt permanently extends via a pinned and welded flash hider to a 16.1-inch overall length. The barrel is cut with a 1-in-7 twist rate for stabilizing longer, heavier 5.56 NATO and .223 Remington projectiles, and the carbine is rated for a 30-round magazine. Finished in black and built around a fully semi-automatic action, it ships without fixed sights, leaving the rail open for the optic of your choice. It is a natural fit for range training and home defense, giving shooters Colt’s mil-spec reliability without the tax stamp and wait tied to a short-barreled rifle.

Key Specifications

• The chambering is .223 Remington/5.56 NATO.
• The barrel is a 14.5-inch bare barrel pinned and welded to a 16.1-inch overall length.
• The permanently attached muzzle device is a flash hider.
• The rate of twist is 1-in-7.
• The carbine is rated for a 30-round magazine.
• The action is semi-automatic.
• The carbine ships with no fixed sights, leaving the rail open for an optic.
• The finish is black.
• Fitted with a Centurion Arms free-float M-LOK handguard (EPR configuration).
• Marked M4 Carbine on the magazine well, matching its mil-spec upper receiver profile.

Frequently Asked Questions

Is this carbine an NFA short-barreled rifle? No. Colt permanently pins and welds the flash hider to bring the 14.5-inch barrel to a 16.1-inch overall length, so it ships and transfers like any other rifle, without NFA paperwork.

Does this carbine include sights? No, it ships without fixed sights so you can mount an optic directly to the rail.

What twist rate does the barrel use? A 1-in-7 twist, suited to a wide range of 5.56 NATO and .223 Remington bullet weights.

Buy the Colt 5.56 NATO Carbine

Colt’s reputation for mil-spec reliability comes through in this pinned-barrel carbine, built to run hard without the extra step of NFA paperwork. Browse our semi-auto rifles selection and order this Colt from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.