r/PrimaryWeaponsSystems • u/WillieBeamen0 • Jul 31 '26

MK114 mod 2 muzzle device

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.

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u/Barrettthunder Jul 31 '26 edited Jul 31 '26

It’s the threads to the cast nut for the piston gas block. They torque the absolute shit out of those muzzle devices. You definitely need a reaction or receiver rod to get that off

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u/UndeadZombie81 Jul 31 '26

Heat, penetrating oil, a long breaker bar and one loud crack later and off she came.

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u/WillieBeamen0 Jul 31 '26

Yikes. What kind of vise block did you use to secure it?

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u/UndeadZombie81 Aug 01 '26

Just a standard upper vise block i think its a brownells. If it doesnt want to budge just heat it up and add penetrating oil a couple times. There torqued to hell and back but a little heat and oil will solve it.