Colt AR15A4 5.56mm Semi-Auto Lower Receiver Assembly

(12 reviews)
Current Stock:

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 MK12. 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
    Hassle-Free Service

    Posted by C. Larsen on 26th Sep 2018

    I was a bit concerned that AU might have a problem working with my local FFL dealer - but nope. No problems whatsoever. That was very welcomed. Plus, the product is exactly as advertised. The entire affair was hassle-free, and I appreciate that service.

  • 5
    Colt AR15a4 Lower

    Posted by JR on 15th Aug 2018

    Lower was as described and super fast shipping

  • 5
    COLT AR15A4

    Posted by Joseph R on 15th Aug 2018

    Colt quality lower to build upon, AU offering a great deal, as well as having excellent customer service on a question, would buy from here again and recommend.