Polytech M14 flash hider

[Troublco]

You shouldn't have a big issue with sight alignment reinstalling the flash hider/sight assy. as they have splines to align them. Once you have reinstalled the flash hider/front sight assy and properly snugged the castle nut there shouldn't be any play; it should be about where it was when you took it off. The splines should be snug enough that the front end won't just fall off; you'll probably have to gently tap it with a soft face hammer as you loosen the castle nut, at least to start.

Also, FYI, there's a small set screw that locks the castle nut in place; be sure to loosen it before you try to loosen the castle nut.

[DD977GM2]

Thanks Trouble. I appreciate the advice and insight!

You shouldn't have a big issue with sight alignment reinstalling the flash hider/sight assy. as they have splines to align them. Once you have reinstalled the flash hider/front sight assy and properly snugged the castle nut there shouldn't be any play; it should be about where it was when you took it off. The splines should be snug enough that the front end won't just fall off; you'll probably have to gently tap it with a soft face hammer as you loosen the castle nut, at least to start.

Also, FYI, there's a small set screw that locks the castle nut in place; be sure to loosen it before you try to loosen the castle nut.

[theGinsue]

Wow. Thanks for the pics. Why on earth would they not just cut those slots out? Sounds like they took a cheap shortcut on this one.

[Circuits]

It was actually an import issue. The early ones were too evil so Polytech left the slots solid on later ones and Mr ATF man was happy again.

[10x]

If you are not out of alignment now, you won't be after you cut the slots.

The alignment comes from the base of the opening in the muzzle break/flash hider butting up against the square face near the muzzle. The splines help keep things aligned, otherwise just eyeball it and you can tell. You can use shims on those faces to change the alignment. National match flash hiders are opened up a little to avoid the bullet contacting the hider.

Don't get the metal too hot when grinding.

The ATF did not allow import of some guns because of features. The muzzle break was one way to avoid a disqualifying feature.

[bryjcom]

Take it off and machine away. You don't need to send it to get aligned unless it doesn't align its self. I quick eyeball down the muzzle end and go shoot it a couple of times. If its hitting the hider than you will see copper marks on the inside of the flash hider.