Armatac makes a dual drum magazine. At first glance one might think of a Beta C-Mag. However, that is as far as the similarities l… | Ammo cans, Drums, 300 blackout
Amazon.com: drum magazine
Airsoft BATTLEAXE 2500rd Drum Magazine Electric C-Mag for M4/M16 AEG Black: Amazon.co.uk: Sports & Outdoors