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Posted: 8/21/2013 8:05:17 PM EDT
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So I just installed the PWS FSC 556 muzzle brake on my new bcm bfh midi upper. My question is how tight is too tight? How much torque would it take to tighten so much that the threads actually stretched and the accuracy was compromised from it? I hear guys that are obsessed with accuracy will just hand tight there muzzle device and use loctite so they don't have to torque it too much..
Thanks for any help. |
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One of these came on my SCAR; I seemed to have a minor misalignment and was an effective but LOUD flash hider. I therefore switched it out for a Surefire FS556K but this (S-F) kit came with multiple washers and a timing chart.
It seems like it would take a lot of torque to over tighten the flash hider, as it came with a crush washer from PWS, and wasn't too hard to remove. Check on the PWS website, or maybe in the directions that came with your PWS flash hider? Specs have to be hiding somewhere, right? |
Exactly, you should be using the right parts and the right tools for the install. If you don't know how to do it take it to someone who does. Not trying to be azz but you come in here asking for help in the middle of the night and then get your panties all twisted up when someone doesn't hold your hand within two hours. Good Luck 
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So, it appears to me, after a brief literature review: With a washer system you are indexing the final position of the suppressor with a series of washers; with a crush washer you are also indexing the suppressor; albeit to 'someone's' (long ago established) specs via the crush washer.
I enjoyed the Online Help video at Surefire, as this switch from OEM to SF was my idea (changing the component) and I didnt want to appear to be ignorant nor did I want to have to go buy any additional thread locker! Rough group, this, for a cherry-popping party! Make sure to clean the rifle barrel threads and also inside of the new flash suppressor (beforehand) with acetone. I also bought a Flash Hider (FH556-212A) in case I didn't love the results of the Muzzle Brake (MB556K), but it was great. A total waste of money, since the FH556-212A is now a (lost) dust collector. Using a TAPCO Interfuse AR Armorer's Tool that can be coupled with a Borka Tools TQ wrench or a (twist to spec) Craftsman TQ wrench. I was able to verify the correct indexing of the new muzzle break with no thread locker (just washers) to install the MB before using the glue, which sets up pretty quickly, imo. OEM Replacement: 
YHM is a great product...worked great on the SCAR; just seemed to throw a big flame? Pistons differ from Gassers, I guess, but rise was no issue for either brand. Best wishes for a great install. |
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