OLD Armerlite AR-10 barrel ?

[jjc]

Hello,
I have what I believe to be an older Armalite AR-10. I say that because the muzzle brake has 4 set screws on it (I took them off), which makes me believe the brake is not pinned? In any event, I am not sure how to proceed because it does not just fall off. I have read about pinned brakes here and I would need to 1) find the pin 2) grind down to flat and then unscrew the brake - if it is pinned. But again, is mine pinned and has 4 set screws?

The whole purpose of this is to put on a threaded different break. At this point, I am not sure if I have threads. Want to know how to proceed before I just start clamping down and twisting the brake ( clockwise) to remove it.

 

[jjc]

I should of additionally asked - if I have to get another barrel to have threads and want to try to save weight, which one to get and not be any shorter than stock.

 

[DRAM40A1]

A photo might help your cause. If it’s a chambered brake, you can insert a rod through the opening to attemp to remove/unthread, if it’s threaded.

 

[EXTREMEPREJUDICE]

Usually the most common reason to permanently attach a civilian version of a muzzle brake is to meet the 16 inch OAL, how long is the barrel?

 

[jjc]

Usually the most common reason to permanently attach a civilian version of a muzzle brake is to meet the 16 inch OAL, how long is the barrel?

well, it is over 16. I would say 20"

 

[jjc]

Usually the most common reason to permanently attach a civilian version of a muzzle brake is to meet the 16 inch OAL, how long is the barrel?

well, it is over 16". Stock Armalite gun. I would say 20".
ok, photo.
You can see two of the 4 holes where there were set screws (one on each side).
Is this barrel threaded? What procedure to get thing off? I don't see any pin or area where they might have covered a pin to keep it on. Seems the set screws were for that. But, like I said it is not coming off by hand.

 

[EXTREMEPREJUDICE]

I've never seen that type of muzzle device. GUESS ONLY, if it was threaded it wouldn't need 4 seperate set screws to hold it in place, in fact it wouldn't need any. I would go on the premise it's a slip on device, heat it with a heat gun and turn it a little (counterclockwise, as you have already determined just in case) to break it loose. Once again, it's just a GUESS..................never seen that one before.