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Roller-delayed Blowback




Roller-delayed blowback was first used in experimental MG-42 derivatives and a 1945 Mauser Sturmgewehr prototype. It then made its way via the Spanish CETME to Heckler & Koch , where it was the basis for much of its product line from the 1950s onwards.

The main examples are the Heckler & Koch HK G3 and HK MP5 .


LIST OF ROLLER-DELAYED BLOWBACK FIREARMS