Griffin's GP-N(TM) (GP-NATO) suppressor is a robust, dedicated 5.56mm suppressor which provides secure fitment to the common A2 compensator. The A2 compensator is a familiar muzzle device to nearly all AR-15 rifle owners. This simple, inexpensive, yet effective compensator has served the military for decades, and has a place on a vast number of firearms in the hands of civilians as well. The Griffin GP-N(TM) was designed to bring modern suppressor technology to the A2 mountable class of silencers which started in the late 90's with the Gemtech(R) Halo. *Sound reduction ratings are approximate based on measurements by the manufacturer and may vary depending on firearm setup and environmental factors.*