*Dust cover not includedWhen using a regular AR-15 magazine with 300 Blackout cartridges the greater width of the 300 BLK's neck and bullet can cause the rounds to stack improperly and even limit the capacity of the magazine to less than its intended amount.This is why the purpose-built Magpul 300 Blackout 30-round PMAG exists to provide perfect reliability and functionality.Magpul has applied all its generation three advancements to this magazine including the proven rugged Magpul polymer aggressive texturing in the front and rear easily interchangeable floor plate and a paint pen matrix for identifying or marking.Magpul PMAG 300 Blackout GEN M3 Magazine30 RoundsPerfect internal geometry for 300 BLK cartridgesTough lightweight reliableMagpul PMAGs are some of the most widely used and trusted magazines in the world for good reason: they are continuously proven through use by military police and civilian shooters.These magazines feature perfect reliability corrosion-resistant springs optimized internal curve anti-tilt followers and simple disassembly steps for cleaning and maintenance.Save time and money when you purchase 300 Blackout ammo at Ammunition Depot! Our online inventory of cheap ammo for sale is available from the top brands you know and trust.Enjoy big savings and fast shipping on our collection of steel targets and paper targets available online at Ammunition Depot.