Precision Armament M4 Muzzle Thread Adaptor Thread 9/16-24 to 5/8-24 Matte Stainless. These Gun Parts from the innovators at Precision Armament feature easy installation & removal instructions with no gunsmith required. With a compact design the Precision Armament M4 1/2-28 & 9/16-24 Barrel Adapter wont weigh your muzzle down with unnecessary ounces. For perfect concentricity and alignment count on a Precision Armament M4 5/8-24 Adapter to outfit your firearm to be the best. Specifications for Precision Armament M4 Muzzle Thread Adapter: Manufacturer: Precision Armament Fabric/Material: HTSR 416 Stainless Steel Bar Weight: 0.24 oz Condition: New Country of Origin: USA Precision Armament M11/M4 Muzzle Adapter 35X-MZD-M4MZTA PERFECT ALIGNMENT EASY INSTALLATION & REMOVAL COMPACT DESIGN HIGH STRENGTH SUPERIOR DURABILITY NUMEROUS APPLICATIONS SHOULDERLESS Package Contents: Precision Armament M4 Muzzle Thread Adapter 35X-MZD-M4MZTA Precision Armament A02003: M4 Muzzle Thread Adaptor Thread 9/16-24 to 5/8-24 Matte Stainless