AR-15 5.56 MAG ANTI-TILT 40RD 40RD BK POLY|ROLLER FOLLOWER Manufacturer Model Number: RM-40 Manufacturer: ProMag Model: AR-15 Polymer Rifle Magazine Caliber: 223 Rem | 5.56 NATO Type: Accessory-Magazines Item Type: Accessory Firearm / Accessory Capacity: 40 Shipping Weight: 0.45 Feature: Anti-Tilt Roller Follower Optic Adjustable Objective: false Optic Reticle Illuminated: false