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Old 09-21-2016, 05:08 PM   #1
allen16323
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Default Trifecta mount question!

The specwar Trifecta mounts, was wondering if they index or torque to the muzzle or to the barrel shoulder? I have a threaded barrel that the threads are concentric but are cut way long in the tooth. I ask because I have a few options it it indexes/torques to the shoulder I can have the break bored out and taped, hoping it is in the shoulder. Cannot really cut the muzzle back because I am right on the end of 26" oal rule and don't want to SBR it but could always pin and weld the brake.

Thanks in advance for info.

Allen
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Old 09-21-2016, 05:50 PM   #2
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They index on the shoulder. The Silencerco thread spec shows .600 +/-.010" from the shoulder to the muzzle, with a .600 min OD at the shoulder. The threads are a bit deeper than that on the muzzle device, but not sure without putting a caliper to it. If they are too long, you can always get a thread spacer that they sell to use for use on .22 cans with short threads when using them on rifles with long threads like this one:
http://www.silencershop.com/accessor...er-1-2x28.html

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Old 09-21-2016, 05:51 PM   #3
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silencerco uses washer type shims for timing brakes, so I would say they tighten to the shoulder. You just need a precision cut washer / spacer to fill the gap.
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Old 09-21-2016, 06:10 PM   #4
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Thought it was the shoulder, so boring the brake out is probably the best option. Don't know about a spacer because tolerance stacking could be an issue would it not? Been so long since I worked in the mechanical end of drafting I can't remember, guess I worked in the construction end too long.
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Old 09-21-2016, 06:15 PM   #5
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If you just need one of the spacers and a timing shim or two, I wouldn't worry about tolerance stacking - they are made for this specific purpose Now, if you need 3 or 4 spacers, that may be a different story. How long are your threads?
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Old 09-21-2016, 06:28 PM   #6
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Quote:
Originally Posted by wtrski76 View Post
If you just need one of the spacers and a timing shim or two, I wouldn't worry about tolerance stacking - they are made for this specific purpose Now, if you need 3 or 4 spacers, that may be a different story. How long are your threads?
Will measure for sure when I return home. Am in town gathering parts for a DIY ss tumbler at the moment.
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Old 09-22-2016, 04:59 PM   #7
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If that brake has a nitride finish (and I think the Trifecta brakes do), boring it out is gonna be difficult.
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