Air carbine muzzle brake

[Toolmaker51]

Sig. Rendoman;
The news media would have the world think as Americans, we can acquire any sort of firearm. Legitimate & private full-auto's are owned by those who are investigated and hold the specific federal permit. Only a couple states do not further restrict the same ownership. Arizona is one of them. The unfortunate incidents are committed with semi-auto's. The media portrays 'auto-loading' equal to 'auto-firing'; either from ignorance or intentionally. Many gun owners know the difference, there are millions of us, but can't educate the public en-mass at the media's rate of saturation. I'd like to know more about Italian firearm ownership too.

I'm working on a sketch for you to illustrate my brake ideas. That I'll PM, maybe we can develop something; sell the plans and description?

So, on to your project. This page Muzzle Brakes: Recoil Results for 308 & 300 Magnum - PrecisionRifleBlog.com [not a site I participate in] has a comparison of screw-on brakes, tested on .308 Win you know as 7.62×51 NATO. No firearm brakes are retained by what you call grains. 3 reasons - insecure means of locking - certainly will not install concentric to the bore - inability to insure muzzle crown 90 degrees to the bore. Depending on barrel profile, a lathe turned threaded portion about .5 to .6 long, with fine threads, a relief, and a shoulder to seat the brake against. Hole patterns distributed over the length are rotated so adjacent rows have a solid portion between. The holes usually radiate square from the bore, or at a shallow angle back. Can't find anything about surface area to bore/ cartridge capacity. There seem to be inside diameters barely larger than groove diameter, and others with a larger percentage. I know that either must be axially & radially concentric, square to bore. Some chamfered like a typical barrel, seen a few aren't. A front sight band will be an issue, although it could be fit to the brake itself with some alignment 'insurance'.