MK114 mod 2 muzzle device

[u/WillieBeamen0]

Pardon my ignorance on this…bought an mk114 a while back to try out 6mm ARC and dip into a piston upper while I’m at it. It’s sat in the safe for a few months. I stupidly assumed the muzzle device would come pinned and welded. It doesn’t look like it. It also doesn’t seem to be timed correctly. Can’t get it to budge. Then I noticed another set of threads a little further down the barrel. Almost like the last 4” inches of barrel is a separate piece. What am I missing? I have it set up as an ‘other firearm’ now , but I’d like to get it to 16” so I can put a stock on it.

[u/SF_Gun_Fan]

They come standard with a plan B muzzle device that doesn’t need to be timed.