Colt M4/AR15 4-Position Receiver Extension

(12 reviews)
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Colt M4/AR15 4-Position Receiver Extension


Factory Colt 4-position receiver extension for M4/AR15 type rifles.


  • 5
    Keep it Colt

    Posted by John Pipolo on 16th Oct 2022

    ArmsUnlimited is an excellent source for authentic Colt’s parts. Whether you’re working on a clone or your old standby Car-15.

  • 5
    No hassle

    Posted by Michael DiBetta on 27th Oct 2021

    Just want to say. Thank you for quick shipping and verification.

  • 5
    4-Position Receiver Extension

    Posted by Bob Tallman on 17th Jun 2021

    quality product, as described, fast shipping

  • 5
    Colt receiver extension

    Posted by Michael on 13th May 2021

    Appears genuine colt, has the real colt 4 position. Replaced a six position on an old colt lower that wasn't genuine colt. Trying to stay a little authentic.

  • 5
    High quality Colt extension tube

    Posted by Randy on 16th Aug 2020

    I am just glad that I grabbed a couple.

  • 5
    nice find

    Posted by Isaiah Frazier on 23rd Jan 2020

    Good price on hard to find Colt part

  • 5
    Colt Buffer Tube

    Posted by Jeremy Boehm on 2nd Oct 2018

    The part met my expectations for a quality Colt Component. You just can’t go wrong with Colt!

  • 5
    Great as expected

    Posted by z on 4th Sep 2018

    Great as expected

  • 5
    Quality Colt parts at great prices

    Posted by Aaron Barentine on 23rd Jul 2018

    Great quality product at great price. Arms unlimited is the only place for individual Colt parts. Super fast shipping and great customer service. Buy with confidence.