This guide breaks down the four main operating systems for Pistol Caliber Carbines and Submachine Guns: Blowback, Roller-Delayed, Gas, and Radial Delayed. It highlights the pros and cons of each, referencing specific models like the CMMG Banshee, B&T SPC, HK SP5, and Sig MPX, offering insights into their mechanical functions and practical performance. The information is presented with an objective and analytical tone from a recognized firearms expert.
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