CMMG Mk57 Barrel, 5.7X28MM, 16.1" Barrel, 1:9 Twist Black Finish, Includes BCG, Fits AR Rifles 57D3F68 Out of stock. Check back later... $449.95
Ruger 57 Threaded Barrel, 5.4", 1/2 x 28 RH, This Kit Contains a Factory Manufactured Stainless Steel Barrel For Optimal Fit and Function 90739 Out of stock. Check back later... $240.53