$ 39. Hogue 08212 Remington 870 12 Gauge Shotgun Kit with Forend, OD Green. 5" barrel 870. This OEM kit includes the tube assembly, swivel assembly with screw, magazine extension spring, and coupling. . workthetrigger. . 94 THIS PRODUCT REQUIRES AN MXT EXTENSION TUBE NUT TO BE INSTALLED ON YOUR SHOTGUN — THIS TUBE KIT WILL NOT ATTACH WITHOUT THE NUT Visit this page for information to ensure you order a complete kit assembly. . These Magazine Extension kits allow for extra rounds in your Remington 12 gauge 870 shotgun. . 1. 18. . . Fast & Free shipping on. $34. Oct 3, 2010 · 21 Posts. . I wanted a 2 shot magazine extension for my 870 express with an 18 barrel and this fits perfectly. The Mesa Tactical Magazine Clamp can be used to more securely retain aftermarket or factory magazine extensions, while at the same time offering flexible accessory mounting options near the shotgun muzzle. The Rem mag extension kit in blued finish, the tube matches my Rem barrel finish almost perfectly. The extension nut and spacer were more flat finish, the nut was really flat/parkerized. . Usually, magazine extension is one of the first upgrades shotgun owners get. GrovTec US Mtmx3 Extended Magazine Tube Mount X3 Remington 870 Brand: GrovTec US 9 ratings Currently unavailable. Increase the fire power of your shotgun with a magazine extension kit. 95. .