Grabbing some mags for your Radial Delayed Blowback 9mm? These Gen II 9mm magazines are designed for use in Mk4/AR15 lower receivers with a CMMG 9mm Radial Delayed Blowback upper receiver and feature the iconic CMMG styling with MOREcapacity than the Gen 1 magazines, 33rd vs 30rds.Exterior dimensions closely match those of common 5.56 AR15 magazines for cross-compatibility with existing mag pouches and carriers.Lifetime Quality GuaranteeWe aim to please, that's why every CMMG product is backed by our Lifetime Quality Guarantee against material and workmanship defects. Learn more.