ProMag Remington Shotgun Magazine Extension Tube-12 Gauge 870/1100/11-87 (PM159)

The ProMag extension kit adds two (2) 3" magnum shells, or three (3) 2-3/4" shells in capacity to 12-gauge Remington 870, 1100 & 11-87 shotguns. The magazine extension is machined from solid billet T6 aluminum alloy, then type III hard-anodized. The extension is secured by a machined steel adapter nut that replaces the factory magazine cap. The spring is precision wound using Chrome-silicon wire for reliability and long life. All steel components are black phosphated. A magazine extension tube clamp is included, along with all mounting hardware.

Remington Shotgun Extension Kit Features
- Legendary reliability
- One piece housing
- Chrome silicone follower spring
- Made in U.S.A.

Remington Shotgun Extension Kit Specifications
- Compatible With: Remington 870, 1100 & 11-87 Shotguns
- Caliber: 12 Gauge ONLY
- Capacity: + Two (2) 3” Magnum Shells or + Three (3) 2 3/4” Shells
- Warranty: ProMag offers a lifetime warranty against manufacturer defects.
- Model Number: PM159
- UPC: 708279010460

***PLEASE NOTE***
If your shotgun has a barrel length of less than 20” the extension tube WILL stick out past the end of your barrel.

If your shotgun has the new style plastic cap held in place by dimples at the end of the magazine tube instead of the metal/plastic clip spring retainer, you will need to make a modification to your magazine tube to install this extension kit. You will need to carefully remove the two dimples with a hand file to allow the ammunition and follower to pass into the extension tube. When newly installed the spring can be stiff and may make it difficult for some people to load to full capacity until broken in.