Colt M4 Carbine 5.56mm Semi-Auto Rifle | 14.5" Barrel

(4 reviews)
Current Stock:

ALL Semi-Auto Colt Rifle Receivers will be marked "Carbine" as of Q4 2020.


Designed specifically for lightweight mobility, speed of target acquisition, and potent firepower capability - the Colt Law Enforcement Carbine delivers.

This specially designed law enforcement weapon system features many of the combat proven advantages of the military Colt M4. With the 4-position buttstock fully retracted, the Colt Law Enforcement Carbine is less than 30.5 in (77.5 cm) in length and weighs only 6.8 lb (3.08 kg) - ideal for tactical deployment and traditional patrol. Colt's Law Enforcement Carbine is available with a step-cut barrel that allows it to accept a grenade launcher for non-lethal options. Furthermore, the handguard has dual aluminum shielding for more effective heat protection. LE6921 comes equipped with a Magpul MBUS backup sight.


  • CALIBER: 5.56x45 NATO (.223 Rem.)
  • WEIGHT: 6.8 lbs (3.08 kg)
  • OVERALL LENGTH (STOCK RETRACTED): 30.5 in. (77.5 cm)
  • OVERALL LENGTH (STOCK EXTENDED): 33.75 in. (85.7 cm)
  • BARREL LENGTH: 14.5 in. (36.83 cm)
  • RIFLING: 1/7 RH

NFA Firearm, Requires FFL/SOT and NFA Tax Stamp.


  • 5
    When AU sells Colts, they sell them FAST!

    Posted by AS on 13th Apr 2018

    Very happy with this purchase! The rifle is in excellent condition with only minor scuffs on the receiver, much better than all of the LE trade-ins I have dealt with in the past. Form-3 transfer was submitted by AU the day after purchase, approved the next day, and shipped the following day! Thank you Arms Unlimited for passing great deals on to your customers!

  • 5
    Amazing deal

    Posted by Jonathan Rider on 13th Apr 2018

    Great condition for a used gun

  • 5
    Colt 14.5"

    Posted by Travis on 13th Apr 2018

    Smooth transaction and rifle shipped quick. Condition of the rifle exceeded my expectations.

  • 5
    14.5 M4 rocks!

    Posted by Spencer W on 13th Apr 2018

    Couldn't pass up a deal on these Colt 6921s. Very impressed with the overall quality and uniqueness of these rifles that you don't see very often.