Colt M4 CQB 10.3 inch 5.56mm Barrel Assembly w/ Fixed Front Sight

(26 reviews)
Current Stock:

Factory Colt M4 CQB profile, 10.3 inch, 5.56x45mm NATO, carbine length gas system barrel. Complete barrel assembly features M4 feed ramp, barrel nut, fixed front sight tower with sight post, and is threaded 1/2-28 for your choice of muzzle device.


  • 5
    Shipping was fast!

    Posted by Enrique Vasquez on 20th Apr 2023

    Really happy with the product came in blue back sealed, no damages, 100% colt product and shipping was fast!!

  • 5
    Great barrel

    Posted by John Z on 7th Jun 2022

    I picked this up on impulse to finish out a MK18 carbine. This is a great quality barrel. It came packaged very nicely and went together without issue. I took the carbine to the range and was pleasantly surprised with the accuracy. It was gassed nicely with and without a suppressor using an H2 buffer.

  • 5
    Colt 10.3 barrel

    Posted by Oziel Reyes on 14th Apr 2022

    colt mk18 commando now, looks super cute!!!!

  • 4
    Mk18 block II FSP

    Posted by Victor on 22nd Mar 2022

    Great price, great shipping speed and communication.

  • 5
    Colt Barrels, Master Race

    Posted by Texas Rex on 16th Mar 2022

    If you’re into that sort of thing, get this pronto

  • 4
    Great on hard-to-find items

    Posted by Rob on 10th Mar 2022

    Great on hard-to-find items and an overall good experience. Only thing I could gripe about is their rather stern guidelines for returns and it is for this reason I may limit my purchases to only the rarest things that I may need.

  • 5
    Colt 10.3 barrel with assy with FSB

    Posted by Frank on 16th Feb 2022

    Received this barrel yesterday and it looks good! This barrel came with the sling mount on the front!!! I'm still waiting on the a delta ring assembly to arrive before I put the upper together.

  • 5
    Colt 10.3 Barrel

    Posted by Chris Lawrence on 23rd Mar 2021

    Fast Shipping! Just as Described!

  • 5
    Colt 10.3 barrel

    Posted by Justin on 1st Mar 2021

    Great barrel at a great price.