BCM® KMR Barrel Nut Wrench (and M4 stock)

MSRP: $19.00
Your Price: $14.95
(You save $4.05 )
Stock Status:
This barrel nut wrench is for your KMR barrel nut. This is for hobbyist install.

This wrench also works for your M4 Lock Nut (Castle type).

1/2" drive.

Like all BCM® products, made in USA (410 Stainless Steel).
***This product contains chemicals/materials known to the State of California to cause cancer and other reproductive harm. To learn more, visit www.p65warnings.ca.gov.***

61 Reviews

  • 5
    Castle Nut tool

    Worked great for a staked castle nut. Standard tool no so much. This works much better

  • 5
    Barrel Nut Wrench

    I had an old 15" kmr that I wanted to put on a new build and customer service was excellent, the part worked as intended and arrived quickly. On top of that, I realized I didn't have the anti rotation tab/indexing plate and when I inquired as to how I could purchase that they didn't have them for sale individually and the gentleman at customer service just went ahead and sent one which was shipped like an hour after the email exchange. I will always love BCM products because they continue to work no matter how rough I use them but the customer service aspect is incredible, especially these days.

  • 5

    Does exactly what it supposed to do and does it well!

  • 5
    KMR Barrel Nut Wrench

    Picked up a used upper and wanted to steal the rail off to put on another upper. Had to have this wrench to remove the proprietary barrel nut. Got the job done. Love the design and love the rail. Highly recommend.

  • 5
    Outstanding Buffer Tube install / Castle Nut Tool

    Outstanding Buffer Tube install / Castle Nut Tool! This thing locks tight and makes easy work of torquing down or loosening the castle nut.

  • 5
    BCM KMR Wrench

    Used this to remove a KMR nut that seemed welded to a factory PWS Bootleg Upper 13” Rail. I could not get the KMR nut to come loose until I used this tool. The cheap AR Chinese steel tool I used prior to this bent, and marred up the nut before I just placed the order for this tool. Highly recommended if you have an AR with this type of hand guard.

  • 5
    Excellent quality tool

    Made well, fair price, good service

  • 5
    Castle nut wrench

    Sturdy product, compatible with 1/2” drive ratchet or torque wrench. Zero issue soo far.

  • 4
    Does the job

    I bought this because my armorer's tool didn't fit the BCM barrel nut. This worked fine, but was a little pricey for the single purpose I needed. If you need it, there's nothing that can do the job better.