The Little Bastard is the smaller version of Fat Bastard, making it ideal for smaller rifles that can't handle a large muzzle brake. The LB can be turned down to .850" diameter to blend completely as if it were an integral part of the barrel on a non-magnum cartridge. Magnum cartridges should not be turned down. The brake should be left 1.0" in diameter and chamfered on the end to blend into the barrel. American Precision Arms Gen 1 Little Bastard 5/8x24 Muzzle Brake G1L58GSS