Description
Shim pack for timing muzzle brakes on 450 Bushmaster uppers & newer 45-70 lever actions (11/16 x 24 TPI) or M-14/M-1A gas systems snug to the barrel
If you are trying to use shims to time your brake on your 450 Bushmaster (with 11/16x24tpi threaded muzzle), you’ve come to the right place to get stainless steel shims that fit!
These also work to shim the M-14/M-1A gas system snug to the barrel.
Multiple customers have reported success with these shims on their new 45-70 lever-actions (with 11/16x24tpi threaded muzzles) and muzzle brakes.
Will ship to Canada (requires payment of the Canadian shipping fee).
This pack includes 6 shims:
one – .020 thick shim (marked blue)
one – .010 thick shim (marked red)
two – .007 thick shims (marked black)
one – .005 thick shim (marked gold)
one – .003 thick shim (marked green)
ID: .687″ (+.005 / -.000)
OD: .873″ (+0 / -.005)
Thickness +/- .0005
18-8 Stainless steel
On muzzle brakes, you may need 2 packs depending on how far out of time your brake is. On brakes that cannot be more than 90 degrees out of time, one pack usually suffices. An AR upper comes from Bushmaster with an 11/16x24tpi threaded muzzle: .556 and 30 cal shim packs are too small, .338 Lapua are too big. The factory gets around this by using a crush washer. Crush washers are a bad Idea if you are planning on hanging a can off the end of the barrel. Use these shims and have some peace of mind! Always recommend using a good thread locker like Rock Set or ‘red’ thread lockers when affixing muzzle devices.
These may work for the 458 SOCOM, 500 Beowulf, etc. I don’t have one to try. Check the threads OD and if its just under .687 these should work!
We will ship these shims to Canada. These shims have use in automotive applications where items require precision separation/shimming.
badgerridge (store manager) –
Perfect shim pack to time and tighten up the gas block and barrel tension on your M1A. Definately improves the accuracy of your rifle! (transfered from old website)
Matt Romero (verified owner) –
Thank you for making this soooo easy. Bought two for my M1A’s and could not be happier with the fit and ease of installation. Should improve my groups. Thanks again!
badgerridge (store manager) –
Thank you for taking the time to help others by writing a review!
Robert W. (verified owner) –
Fast service, good product, happy customer.
Kenneth J. (verified owner) –
These washers are a good piece of gear for tightening the gas system on your M1A/M-14 to eliminate movement and enhance accuracy. Shipping was quick and the price beat everyone else who sells these.
Anonymous (verified owner) –
Thanks for making it easy. A++
Robert S. (verified owner) –
Got exactly what I needed for my M1A and got it within a couple of days. I was referred from a YouTube channel called GunBlue490
Phillip T. (verified owner) –
Great shim pack to correct the gas system fit on the M1A. The shims are provided in 5 different thicknesses providing the capability to correct a multitude of possible fit scenarios. This provides a great value to the gunsmith or hobbyist.
james hintzke (verified owner) –
worked perfect, will use in other rifles if needed.
chrispmetcalfe (verified owner) –
Best M1A gas shims available. The color coding system makes them easy to use and get the best fit possible. Love that Badger Ridge is a veteran owned family small business.
I discovered the product from GunBlue490, great YouTube channel.
Thank you all for your excellent work
badgerridge (store manager) –
Thank you for taking the time to help others by writing a review!
adam s. (verified owner) –