I got it in 22 cal... I want to knock the Snot outa some Ground Squirrels. I also bought a scope for this gun.... Hope it is OK... UTG 3-9 Mil-Dot RGB Illum.Since this gun does not come with a Muzzle Brake, do you think there would be any benefit in putting one on? If so..... Point me in the right direction. I'm not sure, but I believe the barrel is 5/8" (16mm).Snakebite