Stag 15 Carbine Receiver Extension Kit

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The Stag 15 Carbine Receiver Extension Kit includes everything you need to attach an aftermarket buttstock.  It is designed for the attachment of mil-spec buttstocks.



  • Carbine action spring
  • Carbine standard weight buffer assembly
  • Mil-spec 6-position extension receiver
  • Receiver end plate
  • Receiver nut

SKU: STAG300256


Does Stag Arms offer installation instructions?

We recommend this item be installed by a gunsmith to prevent any damage to the rifle.


8 Reviews

  • 5
    Great mil spec kit

    Posted by Jason Ward on 3rd Apr 2021

    Great quality, standard mil spec receiver extension kit. Great price

  • 5

    Posted by Daniel Roberson on 14th Mar 2021

    Very good quality parts, just took a very long time to get shipped... the times we're in now, very happy with Stag though.

  • 5
    Well made

    Posted by Joseph Leighty on 16th Feb 2021

    Very nicely made components. All fit well and finish was excellent.

  • 5
    Good fit and finish

    Posted by Brad on 11th Jan 2021

    I have used these extension receiver kits on several builds and there are very well made and work as expected. I purchased another make kit and the finish was not up to the same standard; one could feel ribbing inside the extension receiver, which required constant cycling along with the OEM dry lube to smooth out. This was not the case with the Stag extension receiver, which is very smooth and requires no break in. The only issue for me was the receiver end plate, which has ambidextrous belt loops. If you don't want belt loops, you will have to purchase the loop-less end plate elsewhere, as Stag no longer offers them, but they are a low cost item and it's not a big deal.

  • 5
    extension tube kit

    Posted by john altmeyer on 14th Jul 2020

    Very nice fit and finish and priced fair.

  • 5
    Buffer tube

    Posted by Jimmy Jenkins on 22nd Jun 2020

    Great fit, great quality

  • 5
    Perfect fit

    Posted by TMoore on 7th Nov 2017

    Came as described and was very easy to install and works A-OK!

  • 5
    Mil-spec perfect fit on non-Stag Lower

    Posted by Henry on 1st Nov 2017

    Note: I didn't use the included