Ruger PCC barrel or MCARBO muzzle brake stripped- ever happen to you?

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I installed a muzzle break made by MCARBO on my brand-new Ruger PC Carbine. There is a crush washer that goes on before the muzzle break. I followed the directions exactly as on the MCARBO website. Wrap in masking tape, 13/16 wrench etc As I was tightening and before the crush ring was even crushed, the muzzle break jumped the threads.

I contacted the dealer that sold me the MCARBO as I thought it was the brake that stripped. They were great and shipped me a new one. I installed that one and the same thing happened but this time it was just from hand tightening. I had very little pressure applied when it happened initially, I am shocked that the threads let go so easily.

Any idea where I can go from here? I have emailed the canadian service centre and I am going to follow up with pictures as they have never heard of this happening before. Just wondering if anyone on here has had a similar issue.
 
Put the muzzle protector back on and see if that will tighten.If not then the thread is stripped on your muzzle.Cross threaded the first break when installed?From what I saw there is a rocksett wrench that comes with the MCarbo muzzle break that tightens as a lock nut rather than a crush washer.
 
LouF, neither of the 2 muzzle breaks will tighten. In fact the second jumped the threads when I was hand tightening it. I think there are two separate kits, one with Rocksett, one with crushwasher and I just happened to end up with the washer one.
 
If your muzzle threads are good then MCarbo has an issue with their supplier of the muzzle break.I had an issue with their trigger spring kit and called MCarbo.They were good to talk to.
 
Do you have a caliper you can check the minor diameter of the threads of the two brakes? And major diameter of threads on barrel?
 
adamg said:
Do you have a caliper you can check the minor diameter of the threads of the two brakes? And major diameter of threads on barrel?
Click to expand...

I dont have a caliper but I can probably get one. However, that is all no longer needed. Ruger emailed me today and they are replacing the barrel and foregrip at no charge. Now that is amazing customer service and they just gained a client for life. Awesome. Thanks for the tips everyone.
 
Great service by Ruger. I just installed the muzzle brake on my PCC last night. It threaded correctly and really took some wrenching to bring it to its final position. Looks pretty bad a$s! Might even be practical! :)
 
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