GLOCK 21/30 45ACP 40RD DRUM BLACK POLYMER Manufacturer Model Number: DRM-A37 Manufacturer: ProMag Model: Glock 21/30 40 Rd. Drum Caliber: 45 ACP Type: Accessory-Magazines Item Type: Accessory Firearm / Accessory Capacity: 40 Shipping Weight: 1.95 Feature: Black Polymer Drum Feature: Fits Glock 21 & 30 Models Optic Adjustable Objective: false Optic Reticle Illuminated: false