This is CMMG's innovative 30 round 9mm magazine for AR-15 platforms.
Featuring a clever insert and spring system which fits inside a standard Magpul PMAG, offering advantages of the classic hardwearing Magpul design, sizing and grip features with a reliable 9mm feed.
Ideal for 9mm AR blowback and straight-pull conversions with bolt based ejectors, with the need for special lowers to take Glock mags.