brake wont fit Help

[Seandradamus]

I went to go install my schuler brake yesterday and it would only screw on 1 revolution and then it was too tight.
So , I thought ( maybe different threads)
I grabed my gap 308 took the thread protector off and compared the threads , looks the same , heres where it gets weird,
The gap thread protector screws onto the other rifle perfectly. The brake also works perfectly on the gap rifle. I would love to here an explanation of how this is possible.

 

[roggom]

Whats the make/model other rifle? Were the threads factory cut?

 

[Seandradamus]

Its defiance deviant with a kreiger barrel
Built by Joe collier

 

[MitchAlsup]

There is a 0.001 to 0.002 error in the threads that were cut. Not visible to the eye, but plainly obvious to the part getting threaded on.

My guess is you take a dial caliper to the threads and take a few measurements the error will become obvious.

 

[mk44666]

Look at the threads insie of the brake to see if there is any dried thread locker on the threads. I had the same thing happen to me with a DTA brake it was very hard to see at first had toclean up threads with wire brush.

 

[Seandradamus]

Look at the threads insie of the brake to see if there is any dried thread locker on the threads. I had the same thing happen to me with a DTA brake it was very hard to see at first had toclean up threads with wire brush.

There was an aac adapter on the rifle previously and some locktite. I scrubbed it all off. It feels like it is binding On metal though, it is just strange that the other thread protector from the other rifle threads on nicely.

 

[BDA2]

Jesus..... Stupid replies.....

Go buy a tap that has the correct threads. Run the tap into the brake. Problem solved.

I had to do the same thing with mine.....

Posted Via Glade Plug In.

 

[BDA2]

Hell, if you don't want to buy the tap just go to a machinist and have him run a tap down it.

Posted Via Glade Plug In.

 

[BDA2]

For when my suggestion fixes your problem...... You're welcome.

Posted Via Glade Plug In.

 

[Seandradamus]

I understand your fix ,it's amazingly insightful I was wondering how it could be that the muzzle brake threads on a different rifle and the thread protector from that rifle also fits on the rifle in question.

 

[BDA2]

Sloppy threads on one or the other. It's common.

Posted Via Glade Plug In.

 

[Elite_KG]

Improper thread depth or width will also cause fitting issues. I agree in re-tapping with the proper thread tap/die.