Lancer Systems L5 Advanced Warfighter AR Rifle .300 AAC Blackout 20 Round Rifle Magazine Translucent Smoke 20RD. 300 Blackout ammunition (200+ grain) the Lancer L5AWM 300BLK magazine features an updated internal geometry which allows longer heavier cartridges to stack properly increasing feeding reliability when compared to a traditional .223/5.56 magazine. The outside of the mag body is molded with distinctive .300 Blackout markings and the magazine ships with a contrasting flat dark earth floor plate for easy visual identification. Specifications for Lancer Systems L5 Advanced Warfighter AR Rifle .300 AAC Blackout 20 Round Rifle Magazine: Manufacturer: Lancer Systems Color: Translucent Smoke Magazine Capacity: 20 Round Caliber: .300 AAC Blackout Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Condition: New Dimensions: 11 x 3 x 6 in Country of Origin: USA Package Contents: Lancer Systems L5 Advanced Warfighter AR Rifle .300 AAC Blackout 20 Round Rifle Magazine What firearm models does the manufacturer say Lancer Systems L5 Advanced Warfighter AR Rifle .300 AAC Blackout 20 Round Rifle Magazine is compatible with? The manufacturer says that Lancer Systems L5 Advanced Warfighter AR Rifle .300 AAC Blackout 20 Round Rifle Magazine is compatible with AR-15Lancer Systems 999-000-4280-02-20RD: L5 Advanced Warfighter AR Rifle .300 AAC Blackout 20 Round Rifle Magazine Translucent Smoke