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This extension metro barrel has Remington thread system and will not fit barrels with any other style thread system which include Remington Pro Bore and Remington Spartan.
The Metro system was developed for shotgun shooting in areas or at times when noise is not a desirable effect. As a secondary effect, the Metro system will reduce felt recoil by as much as 80%, and when used with special sub-sonic ammunition, developed by Federal Cartridge and eliminates the need for hearing protection. When fired, the Metro extension, installed on a 12 gauge won't even set off hearing sound reduction equipment. The decibel readings are about 72db. Simply remove the shotgun's choke system and install the Metro extension. Then, add the choke to the muzzle of the Metro extension and you're all set to shoot. The Metro system is a barrel extension that is specially ported to reduce muzzle noise by half. The 32" extension installs easily in seconds by threading on in place of a choke tube. No modification to the gun is necessary, and the Metro will even accept your gun's original choke tubes. Blue matte, 12 gauge only. Features: Offers very low noise levels when used with sub-sonic ammo Notes: 32" overall length -- Extension is screwed into choke tube threads -- Metro tube is threaded to accept original choke tubes --Tube is drilled to help reduce recoil and noise -- Heavy loading will not harm Extension