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Centerfire Rifles - Manually Operated Lever action, bolt action or other non gas operated centerfire rifles. |
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muzzle brake -- shim vs. crush washer
Is there any benefit to using shims vs. crush washers to time a muzzle brake? I have a brake I need to install on my Remington 700 PCR. The brake was supplied with a crush washer. I suppose the first step should be to thread the brake on and see how it is timed without.
Do you ordinarily use a bit of thread locker on brakes? Like the blue Loctite? |
#5
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Or, just get one of the self-timing brakes like the heathen or little bastard.
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#6
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Shims also do not leave gap area, which crush washers do when not fully crushed.
Andrew - Lancaster, CA NRA Life Member, CRPA member, Calguns.net contributor, CGF / SAF / FPC / CCRKBA / GOA / NAGR / NRA-ILA contributor, USCCA member - Support your defenders! |
#8
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Quote:
https://spartanrifles.com/collection...18286180335734
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The inconvenience of poor quality lingers long after the thrill of a good bargain. |
#9
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The fact is, unless the threads on muzzle and brake just happen to have been cut perfectly--in relation to one another, and by different manufacturers--such that the brake threads right on and stops at just the right point of its rotation on the threads (which seems unlikely), then is it not inevitable that it will be necessary to time the brake, either with shims, a crush washer, or a lock nut? I guess the other alternative would be to mill some material off of the brake or barrel until the brake is correctly timed. That would be a complicated task, and would mar the finish. But that is why the world uses shims and crush washers, right? Which is what a gunsmith would do... Last edited by hotrail; 05-21-2019 at 10:53 PM.. |
#10
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Quote:
very common, not a complicated task at all. way easier than cutting/reaming a chamber |
#11
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Last edited by mmlook; 05-21-2019 at 10:59 PM.. |
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You should be able to mount a muzzle break with crush, or shim without any help. |
#13
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There are several brakes available now that do not need washers or shims to properly time. Spartan, Area 419, American Precision Arms. Take your pick. All good products.
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#14
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#15
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Shims are next. Crush washer is worst. The reason is that crush washers don't necessarily crush evenly. Shims will at least be flat when tight since they do not collapse. Most suppressor mounts come with strich warnings against use of a crush washer and usually include shims. This is because the mount must remain straight/square to the bore so that bullets do not impact the muzzle device. I recommend muzzle brakes and barrels be machined to time correctly without any shims or crush washers and I provide that service.
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#16
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So can crush washers as long as they have enough travel remaining in them.
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Randall Rausch AR work: www.ar15barrels.com Bolt actions: www.700barrels.com Foreign Semi Autos: www.akbarrels.com Barrel, sight and trigger work on most pistols and shotguns. Most work performed while-you-wait, evening and saturday appointments available. |
#17
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I have threaded a LOT of barrels and then installed "self timing" brakes on them while the barrel is still setup in the lathe with less than 0.0002" bore runout and I have found that self timing brakes generally do not have an exit hole centered on the bore. Here is a machine timed surefire brake:
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Randall Rausch AR work: www.ar15barrels.com Bolt actions: www.700barrels.com Foreign Semi Autos: www.akbarrels.com Barrel, sight and trigger work on most pistols and shotguns. Most work performed while-you-wait, evening and saturday appointments available. |
#18
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Quote:
__________________
Randall Rausch AR work: www.ar15barrels.com Bolt actions: www.700barrels.com Foreign Semi Autos: www.akbarrels.com Barrel, sight and trigger work on most pistols and shotguns. Most work performed while-you-wait, evening and saturday appointments available. |
#19
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Quote:
I have done it over 1000 times and just now found out it can't be done.
__________________
Randall Rausch AR work: www.ar15barrels.com Bolt actions: www.700barrels.com Foreign Semi Autos: www.akbarrels.com Barrel, sight and trigger work on most pistols and shotguns. Most work performed while-you-wait, evening and saturday appointments available. |
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