Picked up a Mak90, can't figure out the muzzle threads

[mini14jac 1]

Bought a rough looking Mak90 and started making it 922r compliant.

When I bought it, the barrel was threaded for a muzzle brake, which I thought was a plus at the time.

Bought a Tapco slant brake, but it slips right on.

 

Tried an AR15 flash hider. It will start on there, but it appears to have 36 threads per inch, RH.

I tried a 1/2x36 flash hider for a 9mm AR pistol.

It will make it almost two turns then stop.

 

It's not 1/2x28, it's not 1/2x36, and it's too small for a 14x1LH slant brake.

 

At this point, I'm considering silver soldering or welding a brake on.

 

Any ideas?

 

[Spacehog 2,207]

That is tough without seeing. Most of the Mak 90s imported had the muzzle turned down. In many cases, they were turned down the minimum or less of the thickness needed to thread 14X1. Unless someone else comes up with another suggestion, I think you have covered the common caliber threads, and the plan to permanently attach or go without may be the only option left.

[G O B 3,509]

A $7 Harbor freight mike and a ruler with a fine metric/standard scale will give you the thread and body size of the muzzle.

[mini14jac 1]

I put a thread gauge on it.

I was wrong about the 36 threads.

(Should have taken notes and not gone from memory.)

It's 1/2-32.

 

Looks like one option is a shoulderless adapter from Precision Armament.

Would convert from 1/2-32 to 5/8-24 and then I could put a .308 flash hider on it.

I don't want a giant brake on here, was actually hoping to put a slant brake on it.

May just get a thread protector.

 

Really more hassle than I was looking for.

Not sure why someone picked that particular thread.

[mini14jac 1]

 

Looks like one option is a shoulderless adapter from Precision Armament.

Would convert from 1/2-32 to 5/8-24 and then I could put a .308 flash hider on it.

 

That's what I did.

Ended up pretty nice.

 

[uzitiger 193]

I made the same mistake about 17 years ago until I found out that they use left hand threads. It threads on in a counter clockwise direction.