The 12GSF Low-Drag High-Visibility 12 Gauge Shotgun Follower from Phase 5 is a generic upgrade part that will promote reliable, smooth feeding without binding in many 12 gauge shotgun tube magazines and extension tubes. It's precision machined from extra-hard 7075 T6 aluminum bar stock (about 80% stronger than standard 6061 alloy) for a smooth, burr-free surface. The bright red, green or blue anodized finish, white lettering, and open center help you quickly identify visually or tactilely that the magazine is empty. Helps you quickly ID that magazine is empty Machined aluminum for durability & smooth operation Drop-in replacement for factory follower on many 12 ga shotguns (see Gun Tech Note below) Available in 3 eye-catching colors The Low-Drag High-Visibility Follower will fit most factory 12-gauge shotgun magazine tubes and extension tubes that DO NOT have spring/follower retention dimples. If your tube has dimples, you will need to remove them or replace the magazine tube in order to install the 12GSF. Phase 5's 12GSF Low-Drag High-Visibility Follower is a quick, simple upgrade that improves the safety and reliability of your 12 gauge shotgun. Brownells Gun Tech™ Note: The 12GSF is known to fit the following popular shotguns: Benelli M2 & M4, Mossberg 500 & 930, Remington 870, 1100 & 11-87, Keltec KSG (two required), Stoger M3000. Will not fit the Benelli Nova/SuperNova/Vinci/Super Vinci, Browning BPS & A5, CZ 612 & 712, FN SLP, Franchi 912 Variomax, Winchester SX2 & SX3.