Thanks for the comments. All the muzzle devices are A cat compliant. All are closed at the front unlike "flash suppressors" which are specifically designed to "suppress" the flash. I have renamed them so as to not cause confusion. The Cyclone brake performs slightly better inside the can, doesn't need clocking, and will be less obnoxious to those on either side of you at the range. From memory they are only about 1dBA louder than a bare muzzle where the two port brake is about 4 dBA louder but with better recoil.
I am testing the 556 version now and have a mid sized design for up to 6.8. With the brake the can is good for 308 down to 14.5". I will be expanding the range of brake threads to accommodate all barrel sizes. I will even be able to provide 1/2-28 thread for 308 sized rifles by drilling up the 556 brakes.
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