Modifying a permanent muzzle brake

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Autopistola

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I would like to have a gunsmith modify my permanently attached muzzle brake to control the muzzle rise of my romanian AK.

A little info: It's got a 12" barrel with a 5" muzzle brake welded on at the gas block/front sight. It has 12 ports, with three ports at 3, 6, 9, and 12 O'clock. AK's tend to recoil up and to the right (hence the usual slant brake), but I'd like mine to recoil straight back so I can do double taps and actually hit something with the second shot.

My idea is to have a gunsmith fill in the bottom ports and one or two of the left ports to combat muzzle flip. So, if it was your job to do, how would you go about it? What would you fill the ports with (weld, braze, etc.)? How would you finish up the job so the inside was smooth (same ID as barrel OD)?

Perhaps there is a way I could do this myself without adversely effecting accuracy. I am mechanically inclined, like to tinker with guns, and was a mig welder for a time. Ashamed to admit this, but I even pondered using JB weld! LOL!
 
"Ashamed to admit this, but I even pondered using JB weld! LOL!"

I've seen JB do some amazing stuff, not that it would work here. I'm thinking more along the lines of wrapping the brake in duct tape and cutting out the ones you want to keep.
Two things you'll never hear a man say, "I don't think duct tape will hold that." and "This beer is just too cold." LOL
 
I would drill all the holes to a larger size and tap the ones you don't want. Then use set screws to close them up. In this fashion you can experiment all you want.
 
Just remember to watch the depth on the set screws. You do not want to have them in the bullet path. It might be best to take the point off of the set screws prior to putting them in. Also if you do not tap them completely, ie leave the tap hole tapered you can run them in tight and loctite them in and then grind off any excess.
 
Years ago I was experimenting with a brake on a .223 Mini(mal)-14.
I built a brake utilizing an expansion chamber and a fairly tight exit hole. I had it venting through about 18 holes tapped for an 8-32 screw.
I was able to tune it for very little muzzle movement using only about 6 of the holes as vents.
It was pretty darn loud so I built another version using several thin slots before the holes, angled forwards at about 15 degrees to deflect the noise forward, away from the shooter.
Then I got a Valmet M71S and lost all interest in the minimal14 and its goofy brake. I think its still in the back of my safe somewheres.
:)
 
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