[Skunkabilly]

What tool do I need to tighten it? Right when I was starting to get decent groups, at a line break, the brass deflector thingy I borrowed at the rangefell on my rifle, and my groups turned into patterns 8" low. THe muzzle brake is a little wobbly, I suspect that is the problem?


Flash suppressor pliers
http://www.springfield-armory.com/shop/shop_image/product/thumb/M1A_acc/ma5014sm.jpg
Will this work on muzzle brakes?

[Kaylee]

Didn't we already do this Skunky?

Yes, that's exactly what you need... just tighten up the castle nut a tad. Remember to back out the little retaining screw on the front sight post first. It's that little hole on the muzzle end of the post -- there's a screw in their (allen head, I think) than connects up with the holes in the castle nut and locks it in place.

-K

edit -- oh yeah. It'll work for muzzle brakes just fine... presuming they're not soldered in place or som'n. The pliers are for the little castle nut in the front sight/flash supressor assembly. What exactly it is that the nut's holding down onto the barrel is immaterial.

[Frohickey]

I would take out the flash suppressor set screw (castle nut retaining screw), and completely backout the flash suppressor nut (castle nut), and the flash suppressor/muzzle break.

The barrel is supposed to have a keyway, and a small chunk of metal on it, which mates to a corresponding slot on the flash suppressor. Maybe that chunk of metal is missing.