Magna porting would reduce muzzle velocity a little, muzzle brake would not because the barrel is left intact. I'm not sure what the cost difference would be, magna port vs. have the barrel threaded for a brake.
Be sure to try a rifle that's ported or equipped with a brake first. The muzzle blast can be a bit much for some folks. I like my brakes but they took some getting used to, I have four now. I'm like a dog with his head out the window when I get hit with the blast. It's like surround sound vs. stereo for me. Adds to the experience.
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"If someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun." The Dalai Llama (5/15/01, The Seattle Times)
"That rifle on the wall of the labourer's cottage or working class flat is the symbol of democracy. It is our job to see that it stays there." George Orwell
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