grayfox Wrote:Smaller calibers typically have smaller diameter barrels, the 12-28 means 1/2 inch threading diameter, 28 threads per inch.
There are standard minimum acceptable barrel diameters for various threadings that can be done.
the 6-6.5-7.62 calibers typically have a 0.700, 0.800 or so barrel diameter, that's why you use a 5/8 diameter threading and the 24 tpi is the standard threads per inch. The barrel needs enough "shoulder" (thicker than the threading) for the suppressor to snug up to. Quality barrels are done via a single-point, essentially no tolerance thread cut - grade 3 I believe it's called.
For a 556 the normal thread cuts are the 1/2-28, so if you use a 7.62 can probably you would use first, a 1/2-28//5/8-24 adapter, then the normal 5/8 can adapter. Some models of suppressor have the 1/2-28 thread-straight to the can thread (probably around 3/4-1 1/6 or something dia)... in that case you get a 5/8 can adapter/brake and a 1/2-28 adapter/brake, for the 2 kinds of muzzle threads you probably have.
Would also point out that there are some barrels with a less typical 9/16-28 or whatever threading, so double check what you have so you can use the can where you need it.
Area 419 adapter pieces are $40, usually less than the xyz suppressor model brake... so it can save you some money. As a brake, I got to say that the Tbac brake isn't as good a brake as others I have but it works... just that, for brakes, the VG65 series has me spoiled as to effectiveness.
The tbac-ultra 7 is a 7" can, titanium. I'm sure there are other good ones too. I don't get any commissions just recommend what I found to be a really good one.
One more item, never never never use a crush washer with a can!
From what Im seeing, you dont need to use an adapter to move up or down in thread pitch. At least with Dead Air series and the QD mount.