Until the end of 2018, Windham Weaponry offered only one 9 mm option and it wasn’t even a whole rifle. It was a blowback-operated caliber-conversion kit included with the company’s RMCS-4 Multi-Caliber Rifle Kit that I got to work with a couple of years ago. But with interest in 9 mm pistol-caliber carbines (PCC) continuing to grow among American shooting enthusiasts, it only made sense for the company to provide its own platform. The designers wisely chose to make these guns compatible with inexpensive and ubiquitous Glock magazines instead of the Colt AR stick magazines, which are hard to find. This review takes a closer look at the carbine version of Windham’s new 9 mm Glock Magazine Compatible (GMC) models.