Threaded 1/2-28UNEF and designed for 223/556 caliber. Reduced recoil and muzzle rise.
![Image](http://i620.photobucket.com/albums/tt289/threedi/Dragon_02a_zps20f2befb.jpg)
The DGN556B is very effective at managing blast gas as can be seen from this test shot. Its not a flash hider at all, but given that is more effective at braking than anything else in this photo, the muzzle blast management is pretty impressive.
![Image](http://i620.photobucket.com/albums/tt289/threedi/flash_pattern_testing_a_zpsdf3c432c.jpg)
Super high speed video and motion tracking technology detail the exact height and distance the 13'' barrel moved when firing a 62gr GGG 556 round through these two different brakes. First and Second place out of everything tested. The DGN556B reduced recoil by 45-50%.
![Image](http://i620.photobucket.com/albums/tt289/threedi/sep_zpsbce0ee59.jpg)