The best PCC Operating Systems: Blowback, roller-delayed, gas, radial delayed.

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There are several types of PCC or SMG operating systems that are popular. The HK roller-delay system, the Stribog roller-delay system, the CMMG radial delay system on the Banshee, the gas piston, and straight blowback operation. I show some of the more popular firearms and discuss the pros and cons to each operating system.

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