I have a lot of these two port brakes in calibers from 5.56 to .375 (after they have been bored out of course). While they do not quite reduce recoil as much as the MI three port brake, they are very close and do an excellent job or reducing recoil and keeping muzzle rise to a minimum all the while offering a more streamlined appearance. The three port MI brake, which I also have quite a few in calibers from 5.56 to .458 (again, after boring out) is also an outstanding brake offering great recoil reduction and minimal muzzle rise, only it is not quite as streamlined.
30cal two chamber brake
Posted by Jay Howton on Feb 6th 2018
Had a three chamber brake that worked well...but the MI two chamber brake seems to work as well but is not as loud.
Posted by John on Aug 9th 2017
The price was good it functions very well no complaints here.