Roller-Delayed vs. Direct Blowback: An Overview
Two of the most common handgun action operations are recoil and direct blowback operation, each of which offers a number of relative advantages and disadvantages. That said, there is another type of blowback operation, called a roller-delayed blowback action, which, famously, has been utilized by the HK MP5 and American-made MP5 clones like the ZF-5. […]
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