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There isn't much information readily available about RWB as a manufacturer, all I found was this description for the product on other sites: "Fits all rifles/pistols that accepts your standard AR15 magazines. Will accept 5.56/.223 NOT recommended for 300 Blackout or steal cased ammo. NO graphite lube is required with this drum. Reinforced polymer feed tower."

Kijafe, no Sir. This and the Beta-C Drum are not recommended to fire 300BLK form both respective Manufacturers.