Receiver Extension Nut (Castle Nut)

(150 reviews) Write a Review
Stock Status:
To secure lock plate on an adjustable stock for AR15, M4
***This product contains chemicals/materials known to the State of California to cause cancer and other reproductive harm. To learn more, visit***

150 Reviews

  • 5
    Most excellent product

    Posted by michael j crafton on Mar 8th 2021

    Perfect, works to my expectations

  • 5
    Castle nut

    Posted by Kason Windham on Mar 7th 2021

    If you’re looking for a castle nut... this is a castle nut. It does what you need a castle nut to do... good quality and no problems.

  • 5
    Castle Nut

    Posted by JD on Feb 23rd 2021

    As always Great product

  • 5
    Castle nut

    Posted by Jeremy Arver on Feb 9th 2021

    Great quality product like always from BCM.

  • 5
    Support BCM

    Posted by D D on Feb 8th 2021

    I don’t even have an AR but I needed a castle nut for an Ak stock. The quality is second to none but the main reason I went with BCM is because they sponsor the Bongino podcast, which I also recommend

  • 5
    AR15 Castle Nut

    Posted by Henry Renfroe on Feb 7th 2021

    Just liked the original! Perfect fit! Works great!

  • 5
    Great finish

    Posted by It’s BCM... on Feb 3rd 2021

    Great finish and solid steel! It what’s to be expected from BCM

  • 5
    GTG- well made

    Posted by David on Jan 3rd 2021

    I trust these parts! No problems ever with anything I’ve gotten at BCM.

  • 5
    What you'd expect

    Posted by Craig M on Jan 2nd 2021

    Installed well with the BCM Buffer tube assembly.