This is a over barrel suppressor from Neal's Gun Works. It is designed to replace the factory muzzle brake on the Savage 111 LRH .338LM. It has a decibal reduction rating of 25-30db when using factory super sonic ammo and 35-40db with sub-sonic ammo. The suppressor ads only 6 3/8" to the Barrel Length.
The Threads are 5/8" x 24TPI right hand. Should fit any .338 or smaller cal rifle with matching threads and simular barrel contour.