Muzzle break won't stay tight

[Dexter Morgan]

My muzzle break on my AR-15 won't stay tight.
When the gun gets hot, it loosens right off.

It has a crush-washer. But obviously that's not working for me.
Do most people use some type of glue or locktite on the threads?

 

[hfx123]

Blue loctite

 

[Melnibonean]

Wouldn't blue locktite be useless once it gets hot? IIRC, heat breaks apart blue locktite.

Is the break torqued correctly? Might be worth it to try another crush washer. I've used both shims and crush washers and never had a problem with either on any of my ARs, although I prefer the crush washer over the shims personally.

 

[m39a2]

A new crush washer installed with the correct torque will work better I'm thinking!

Scott

 

[Runningfool]

A new crush washer installed with the correct torque will work better I'm thinking!

Scott

This. Don't use loctite on a muzzle device.

 

[Tazzy]

You bought a muzzle BREAK instead of a brake. There's your problem. Must be broken.

 

[snoopycda]

Try hi temp silicone on the threads.

 

[lerch641]

New crush washer. If the ports don't line up when you torque it, use shims.

 

[badboybeeson]

New crush washer. If the ports don't line up when you torque it, use shims.

What he said

 

[ted_dent]

Generally crush washers are one time use only. If you loosened it and then tried to re-tighten it then it will not likely hold.

 

[greentips]

Break out the torque wrench and make sure it goes at about 18ft.lb

I have a factory installed device came loose because the factory did not put enough torque on it. I have to add extra shim.

If you need to use any "thread adhesive " rocksett is the one to use as it goes all the way to 1000 deg. That's what AAC and sure fire recommend for their devices.