CMMG ARC Magazine for AR-15 with Radial Delayed Blowback Upper 9mm 33-Round Polymer Black

The CMMG 9mm AR Magazine makes it possible to shoot 9mm ammunition from your unmodified AR15 lower receiver when paired with a CMMG 9mm Radial Delayed Blowback Upper. CMMG's 9 Ar Conversion is inserted into a Gen 2 or Gen 3 Magpul PMAG. It seats into your AR-15 mag-well and holds up to 33 rounds of 9mm ammunition. Its unique design allows it to feed any CMMG 9mm Radial Delayed Blowback Upper Receiver while maintaining last round bolt hold-open functionality. FeaturesLast Round Bolt Hold-Open9 ARC Internals to be put into Magpul PMAG (Gen 2 or Gen 3)Uses Standard Carbine Buffer and Action Spring