SureFire Muzzle Device Replacement Shim Kit - 1/2x28

Manufactured by SureFire
SKU: Z-71652
MPN: Z-71652
Manufactured by SureFire
2 Reviews

Out of Stock

NOTE: Limit 5 per household. Quantities exceeding 5 will not allow checkout.



One of the benefits of Surefire’s muzzle devices is the highly intuitive timing system, which uses several color-coded shims to achieve your ideal positioning. But, as with any small parts, it’s very possible for these to disappear. If you’re moving your Surefire devices between rifles and need a new shim kit, we’ve got you covered. This shim kit has everything you need for mounting a 5.56 surefire device on 1/2x28 threading.


  • Matches 1/2x28TPI thread pitch
  • Includes 12 Shims of Various Thicknesses
  • Tube of Rocksett included

The kit even comes with a small tube of Rocksett, which acts as a threadlocker to keep your device attached. But be mindful—too much Rocksett can make it very difficult to remove your device in the future. One or two drops is plenty.

SureFire designs and manufactures a wide variety of firearms accessories, from weapon lights to suppressors. The leading manufacturer of rugged, powerful lights, SureFire is synonymous with excellence in handheld illumination.
See More



WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

2 reviews

  • 4 stars
  • 0 reviews
  • 3 stars
  • 0 reviews
  • 2 stars
  • 0 reviews
  • 1 star
  • 0 reviews

perfect product, small OD matches barrel

by -

i bought this kit to time a vg6 muzzle device on a 223/556 cal. i was so impressed how surefire got it right out of so many others that have failed. you will find that the washers have the same outside diameter as the barrel & muzzle devices, even slim examples such as the epsilon 556. the ID is just large enough to slide over the threads with ease. i didn’t even use the thread locker yet since i’m still going back & forth with muzzles but things don’t come loose on a 556 like they do on 762. anyway, i was pretty happy that the dimensions matched up with the barrel and the various thicknesses allowed me to PERFECTLY time my MDs

the only shim kit that works AND looks right!

by -

surefire actually did some R&D before manufacturing & supplying this product, unlike their competitors. these shims have an outside dimension smaller than a standard .750 barrel so that the muzzle device & barrel are streamlined, aesthetically nice. i can’t tell you how many companies like YHM have this .875 or ,9 OD and the shims protrude much farther than the barrel & muzzle - it looks ugly & shade tree - as in just unacceptable. but surefire got it right on their muzzle timing kit. i have these shims on a wylde barrel & epsilon vg6 slim; the shims are smaller than the epsilon but ID big enough to slide over barrel threads without fuss. never thought i’d be so impressed with measley shims but it’s far & few between in the market. i will be buying the item in 5/8x24 as well