The PMAG D50, a 50-round drum polymer magazine in 7.62mm made by Magpul. (Magpul) The D-60, the company’s 5.56mm version, was being evaluated last year for use with the Marine’s M27 Infantry ...

The so-called “drum” magazine allows a Glock to hold an additional 40 rounds to the firearm’s usual 10. NY prohibits their use unless you are active law enforcement or military.