I stand corrected. From the pic and my old eyes it appeared that yours had a brake or comp. I now see it looks kind of like a birdcage on the M16 family. If this is correct and it is similar to an A2 birdcage then it is somewhat compensating the kick as the A2 birdcage was designed for recoil management, flash reduction less dust kick up by venting the gas upwards and therefore the barrel down. But then I can not see if there is a slot on the bottom from the pic.The actual Mk13 Mod 5 doesn't have a muzzle device. The barrel is contoured to fit the Knights Armament Mk11 suppressor.
My Mk13 doesn't have a muzzle brake. It has the flash hider needed to mount the Knights Armament M110 suppressor.
Shooting it with the M110 suppressor isn't as bad as it is without, but it's manageable.
Actually, with 230gr Berger Hybrid VLD bullets, I am getting similar trajectories and range of that of a .338 Lapua with 250gr SMK bullets.this caliber sux...... german army have mostly problems with this......
even a freakin 7.65x39 got bigger punsh.
the best is still the .338