Colt Carbine Short Barrel Rifle Lower Receiver Assembly

(13 reviews)
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Colt Carbine Short Barrel Rifle Lower Receiver Assembly

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


Factory Colt complete lower receiver assembly, registered by Colt as a Short Barrel Rifle to build your AR15 or M4. Compatible with all mil-spec AR15/M4/M16 upper receivers and roll marked "Carbine". Manufactured to truly meet and exceed all Mil Spec standards.

This item is a serialized part, considered a firearm, factory registered as a short barrel rifle and requires transfer through a FFL/SOT


  • 5
    Colt Carbine SBR Lower Receiver

    Posted by John Gorrell on 20th Nov 2023

    Fantastic lower, new from factory. Arms Unlimited carry some of the most interesting, difficult to find equipment at reasonable prices. Always a pleasure to do business with AU!

  • 5
    That you company for your lower

    Posted by Allen Thomas Fredrick on 23rd May 2023

    Hello valued gun person, Please buy this Short Barrel Lower Reciever. As part of our special time give away, we will deliver this lower straight to your doorstep, no FFL required! Please have your dog and proof of purchase ready when we arrive!

  • 5
    Look good

    Posted by Jesse Verne on 25th Jun 2022

    It looks ok I haven't got to do anything because I'm waiting for government

  • 5

    Posted by Tom on 23rd Apr 2022

    Perfect condition and was pleasantly surprised to see the old M4 Carbine roll mark. Now to wait for approval to pick it up…

  • 5
    Colt M4 Carbine Short Barrel Rifle Lower Receiver

    Posted by Billy on 27th Jan 2022

    Great Service! Great Colt Quality! Thanks, Billy

  • 5
    Colt M4 Carbine Short Barrel Rifle Lower Receiver

    Posted by Billy on 3rd Dec 2021

    Great Colt Parts!

  • 5
    Colt M4 Carbine SBR

    Posted by MVF on 4th Sep 2021

    Shipped fast and the lower arrives in perfect condition.

  • 5
    Shorty Commando

    Posted by SG on 24th Aug 2021

    AU was the only place I could find a registered lower. Price was fair and shipping was quick! Thanks, AU!

  • 5
    Colt M4 SBR Receiver

    Posted by Richard Veres on 27th Mar 2019

    I purchased two of these M4 SBR receivers and was very pleased with them. They arrived in perfect condition and ready for my Colt Commando uppers. As always------Arms Unlimited delivers THE BEST the industry has to offer!