How to shim a 51T muzzle brake

[sarthree]

Welll...another victim of the mk18 upper and SDN-6...I put a few extra shims on there, but it wasn't enough. I was going to order another AAC shim kit and some rocksett, but I was wondering if anyone else had a good alternative. The kit is out of stock everywhere...so I am stuck until they come in stock or someone has a good idea.

[Bendersquint]

Welll...another victim of the mk18 upper and SDN-6...I put a few extra shims on there, but it wasn't enough. I was going to order another AAC shim kit and some rocksett, but I was wondering if anyone else had a good alternative. The kit is out of stock everywhere...so I am stuck until they come in stock or someone has a good idea.

You should have been able to index it with the kit they supplied, how far is it off? Thats odd.

[JasonM]

Welll...another victim of the mk18 upper and SDN-6...I put a few extra shims on there, but it wasn't enough. I was going to order another AAC shim kit and some rocksett, but I was wondering if anyone else had a good alternative. The kit is out of stock everywhere...so I am stuck until they come in stock or someone has a good idea.

You should have been able to index it with the kit they supplied, how far is it off? Thats odd.

Bender, he's talking about the fit because of the combo of the "no rear skirt" on the MB and the length of the DD rail.

It ends up being about 1/8" too short to mount a can. Someone should make a 1/8 (or ideally 3/16") precision shim tha you put on first, then use the AAC shims to time the mount.

[Bendersquint]

Oops, thanks for the clarification Jason.

[JasonM]

Oops, thanks for the clarification Jason.

No sweat, hey if you want to make a run of shims, a lot of folks have this problem.

[pjlord28]

i think im have this issue too, i just put the upper together. i have the 51t blackout, an 8" barrel and a 7" rail. should i just sell the fh for a brake, and get a shim?

[Bendersquint]

Oops, thanks for the clarification Jason.

No sweat, hey if you want to make a run of shims, a lot of folks have this problem.

We will do a run of shims if there is enough of a demand for them.

Who would be interested in them?

[robpiat]

I have a bunch of PWS 1/2x28 shim sets here if anybody needs any.

[Bendersquint]

I have a bunch of PWS 1/2x28 shim sets here if anybody needs any.

If they are the standard AAC ones they won't fit for this purpose, you would need 3 or 4 sets stacked to get the size we are looking at.

[robpiat]

I have a bunch of PWS 1/2x28 shim sets here if anybody needs any.

If they are the standard AAC ones they won't fit for this purpose, you would need 3 or 4 sets stacked to get the size we are looking at.

Well you know more about it than I do than. In my uniformed opinion, you shouldn't ever use more than 2-3 shims to get where you are going. They ought to be for timing, not filling a gap. The PWS ones come with a fairly thick bushing, some true shims, and a fine tuning shim.

If you have that much distance to go, I think it would make more sense to get a properly sized and machined bushing that takes up 98% of the gap.

[Bendersquint]

I have a bunch of PWS 1/2x28 shim sets here if anybody needs any.

If they are the standard AAC ones they won't fit for this purpose, you would need 3 or 4 sets stacked to get the size we are looking at.

Well you know more about it than I do than. In my uniformed opinion, you shouldn't ever use more than 2-3 shims to get where you are going. They ought to be for timing, not filling a gap. The PWS ones come with a fairly thick bushing, some true shims, and a fine tuning shim.

If you have that much distance to go, I think it would make more sense to get a properly sized and machined bushing that takes up 98% of the gap.

Thats what we will be making if there is enough demand for it..

[DarkPhoenix]

I would purchase a few.
My Armalite Ar-10 needs a spacer I have the size of the crush washer to go before the flash hider meets the shoulder of the barrel.

[Barobby]

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