APA's MB should never be underestimated. While it may appear small in size this brake doesn't know it's small. All of the Gen 1 require installation by a competent gunsmith. By properly fitting this brake you can achieve a perfect seamless fit on your rifle as well as perfect coaxial bore alignment. American Precision Arms Gen 2 Little Bastard 5/8x24 TPI up to 30 Cal. Stainless Steel Muzzle Brake G2L5830S