The GP (General Purpose) suppressors were designed to provide the customer with a lightweight durable and affordable suppressor for general use. Constructed entirely of 17-4 stainless steel and utilizing our patented baffle technology GP suppressors are both durable and high performance. Front and rear 3/4 ( or 19mm) wrench flats provide options for traditional use or forend rail integrated applications. GP suppressors come pre-drilled with a .125 hole for pinning to create one stamp guns. The GP7� can be pinned on a barrel as short as 9.5 The GP7� is a .30 caliber aperture silencer rated for use up to and including .300 Remington Ultra Magnum. The GP series provides quality engineering construction versatility and affordability in one. Every component in the GP7 is manufactured from high strength high temperature corrosion resistant alloys. - Barrel Ratings: No restrictions Full auto rated on calibers up to 308 winchester - Diameter: 1.5 - Overall Length: 6.25 - Length Added: VS. A2 Compensator 4.8 - Weight: 15.3 ounces - Materials: High Strength High Temp Corrosion Resistant Alloys - Attachment: 5/8x24 TPI (industry standard for most 30 caliber barrels) - Finish: Cerakote - DB Attenuation: 31DB