TangoDown AR-15 Castle Nut Wrench

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In all of our years building and modifying the AR-15/M16/M4, we have used a LOT of different brands of specialized tools here at TD. Some really good, some... well, not so much. One tool we decided that could always use improvement, is the Castle Nut Wrench. Every type we tried, would either be difficult to use in getting the correct torque value, or would scratch/deform the Castle Nut drive notches.

Those days are over with our TD-CNW.

The unique design has a 3/8” drive hole on either side of the wrench, laser marked for proper use. Use a breaker bar on the left for Nut removal, or a Torque wrench for proper tightening on the right. Either direction forces the wrench down onto solid contact with the Nut (unlike wrench lifting away from the nut like on some other designs) for no-mar, positive installation or removal.

The Castle Nut teeth are dimensioned for positive, non-slip engagement that also prevents damage.

Precision machined from 4140 steel and heat treated to 40 Rockwell for long life, finished in a durable black oxide finish. Try one, and you’ll agree this is one of the best tools you can own for high end AR builds.


TangoDown does NOT ship outside the United States

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  • 5
    Best ever

    Posted by Jack Baker on Oct 29th 2022

    This is by far the best and easiest to use wrench you can find. Perfect Machine workmanship. Perfect fit, no marring or wrench scars. Costly but you get what you pay for. Excellent.

  • 5
    Castle nut wrench

    Posted by HDCharlie on Aug 23rd 2022

    I've used a myriad of castle nut tools over the last 30 years, but this wrench is without a doubt the best one ever. Used in combination with one of the jigs that hold the receiver and buffer tube in alignment makes for an unbeatable combination.

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