AR15 Threaded Muzzle Lock Nut

[big50_1]

One way to secure a m. brake on an AR is with a crush washer. How about a lock/jam nut? What would I be looking forand where?

[joelukehart]

Crush washer and a jam nut would all work great along with some Rocksett by flexbar.com. I believe Surefire uses it with their muzzle brakes and flash hiders.

[ar15barrels]

Rocksett does not have nearly the shear strength of loctite.
It has really high temperature rating though.
The temperatures that suppressors run at will easily defeat loctite.



DPMS uses a jam nut to index the Miculek comps they sell.
I personally think it looks like crap so I eliminate the jam nut and just index via machining.

[big50_1]

I also saw somewhere where someone used a "panel nut" w/ 1/2-28 threads. I think you can get them in stainless and brass. What do you think about that?

[Purple K]

Ace Hardware, Home Depot, Lowes or an auto parts store should be able to supply you with a "jam nut", which is just a thin nut. Or, just put a nut with the correct thread size and pitch into a vise and grind it down to your desired thickness. Yes, I know that the heat from grinding may effect the tensile strength of the nut, but it's only acting as a lock by keeping preassure against the threads of the muzzle device. Depending upon how hot it gets and how quickly it's cooled it could become harder or softer, for this application it won't matter.

[ar15barrels]

Ace Hardware, Home Depot, Lowes or an auto parts store should be able to supply you with a "jam nut

Not in 1/2-28.

[ArticleTheFourth]

How about a peel-off shim washer as in this link?

http://www.mcmaster.com/#metal-thin-stock/=4nr962

It's easy to adjust for thickness.

[joelukehart]

If you need a jam nut take a standard A2 comp and part off the rear .220. You know, the part with the flats on it. Chamfer it so it doesn't booger up the threads and you are good to go.

[big50_1]

Thanks for all the good ideas.