Colt Carbine Lower Receiver Assembly

$650.00 $519.00
(127 reviews)
Current Stock:
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Colt Carbine Lower Receiver Assembly

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


Factory Colt complete lower receiver assembly to build your AR15, M16 or M4. Compatible with all mil-spec AR15/M4/M16 upper receivers. Manufactured to truly meet and exceed all Mil Spec standards.

This item is a serialized part, considered a firearm and requires transfer through a FFL


  • 5
    Colt Carbine Lower

    Posted by Nathan T on 18th Feb 2022

    Everything came as expected, and the lower was in overall good condition. Small scratch on the area near the buffer tube, but it’s purely cosmetic. Arrived quickly and functions as it should. Already have a second one on order for different clone build.

  • 5
    Colt M4 Carbine Lower Receiver Assembly

    Posted by C.L. on 9th Feb 2022

    Legendary Colt product. One of the only places in stock. Very reasonable priced. Arms Unlimited is my go to retailer for hard to find firearms and accessories.

  • 3
    Colt m4 lower

    Posted by Andrew Pinheiro on 14th Jan 2022

    Great price and lower arms unlimited Called next day after I ordered contacted my ffl and said they were shipping it next day and I paid for 2nd day air 1 and 1/2 weeks later I wrote arms unlimited they said colt had recall wish they could have at least e mailed me and explained situation I understand if things happen that are out of their control but as a business I feel they have some growing room to do in their customer service

  • 5
    Great lower

    Posted by Samuel McGinty on 26th Dec 2021

    Exactly what I wanted. Shipped out super fast. Might buy another one.

  • 5
    Outstanding Quality

    Posted by Dan Curtis on 27th Nov 2021

    This product was excellent quality.

  • 5
    Colt M4 Carbine

    Posted by John Krzos on 26th Nov 2021

    AU provides the best products on the market. When they have a sale, you can trust AU to come thru with the best prices. The M4 Carbine lower is exactly as described.

  • 5
    Colt M4 Carbine

    Posted by John Krzos on 9th Nov 2021

    LGS was playing a trick on me, by saying I was the first one to received the first polymer lower from Colt he's ever seen! Got my attention real quick. They handed me a Colt m4 lower that was perfect, in everyway. Not a polymer, but aluminum, Great job as always AU.

  • 4
    Colt lower

    Posted by Marshall Davis on 24th Oct 2021

    The colt lower is always solid, but mine had unnatural ware to the coating in the magwell which is very weird for something that is a new factory lower, was offered $20 discount so that was okay I guess

  • 5
    OEM . Upgraded laser markings

    Posted by Edgardo Casiano on 15th Oct 2021

    To tell you the truth these lowers are solid , most enthusiasts criticize de modern upgrade to laser markings/ but this is the way of the future , quality is present and all tolerance is what to be expected from a milspec manufacturer.