Now your choices are limitless! Convert the non-threaded barrel on your firearm to a standard 1/2-28 thread for all your end-of-barrel accessories, such as a muzzle brake, flash suppressor, compensator, sound suppressor, or fake flash hiders and suppressors. This barrel thread adapter easily attaches to the factory-finished plain muzzle. The largest diameter is a little larger than the current A2 Birdcage and similar flash hiders.&l