I ordered a couple of muzzle brakes to mount to my Savage 10TR. The rifle hasn't arrived yet, but the brakes did, haha! Anyway, the one on the left is the GRG Magnum Muzzle Break and the one on the right is the Global Sportsman model 10/15 Tactical Bafflled Short Competition Brake. The GRG unit is absolutely massive and looks like it would be right at home on a tank or artillery platform.
Set this picture up for a size comparison with a 2 3/4in shot shell. The GRG unit just towers over the other Global Sportsman. It is huge. I have no idea how this one handles as I couldn't find any reviews on it, couldn't even find any info on the manufacturer.
There was a bit more information about the the Global Sportsman one, with 7 reviews on Amazon.com but that's about it. In the package, there was a small note saying that they are a small family run business. Anyway, most of the reviews say the brake works well, so I'll keep my fingers crossed.