REXUS UltraShims Muzzle Device Shim Washer Set

REXUS UltraShims Muzzle Device Shim Washer Set

$4.95
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Description

Orient, or "time," your 5/8-24 muzzle device with our REXUS UltraShims extra-thin shim washer set, which includes 2 each of 5 thicknesses of stainless-steel shim washers for 10 total. Shims have a .742 outside diameter that mates perfectly with our line of UltraSlim muzzle devices to allow a .750 gas block to slide on and off. The thinnest, .002, accounts for roughly 17° of muzzle device rotation, the .003 for 26° rotation, the .004 for 34.5°, .008 (69°), and .016 (138°).

By mixing and matching, one can fine-tune timing in .001 increments. REXUSUltraShims provide device timing while allowing maximum thread engagement, unlike thicker methods like lock nuts. Further, UltraShims are infinitely reusable, for those who want to uninstall their muzzle device for cleaning. Finally, unlike crush washers, UltraShims do not introduce misalignment which could damage muzzle devices or expensive suppressors.

INSTALLATION NOTES: The ultra sleek look of our muzzle devices can make you wonder where to put your wrench, but the scalloped "tear-drop" cuts serve as wrench flats. Some use any tool — tape-wrapped — that can slip INSIDE the device through the slots in order to apply light torque.

The first step to install your REXUS Ultra muzzle device with your desired orientation, or "timing," is to get the desired thickness of muzzle shim(s). A quick method is to screw on the muzzle device until it bottoms out against the barrel shoulder, and then back it off until the muzzle device is oriented, or "timed," as desired — and then back it off again from roughly 12 o'clock to 11 o'clock, which will account for final tightening after hand tightening. Into the resulting gap between the barrel shoulder and the rear face of the muzzle device, slip an edge of a shim(s) that fill that gap. With this knowledge, proceed to install the muzzle device with shims. There will be a bit of trial and error, but this method is a quick way of getting you close.

Before installing the muzzle device, put the same moly-lithium grease on your barrel's muzzle threads as you put on your receiver threads when installing a barrel. After you slip on the desired thickness of muzzle shim(s), also grease the rear face of the muzzle device so it is lubed as it contacts the shim face.

To tighten, wrap your wrench jaws or other tool in tape so they don't mar the surface, and then tighten the muzzle device only just snug past hand tightening, roughly the distance from 11 o'clock to 12 o'clock. Don't need to crank on it like you would with a crush washer; this prevents distortion which could affect accuracy.