Tested: Windham Weaponry 9 mm GMC Carbine

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) [...]