This is a GG&G, Inc. Shotgun Magazine Tube Components, model GGG-1437.
The GG&G Enhanced Standard 870 Follower fits the Remington 870" 1100 and 1187 12 ga. shotguns. Installs just like the factory 870 follower. Newer shotguns that have a cut tab protruding into the magazine tube require any easy modification to the tube prior to installation.
Features:
Better control of spring movement
stainless steel
Corrosion and wear resistant