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Rifles are generally much more powerful with high pressures that require them to remain locked long enough for the bullet to exit the barrel and pressure to drop. A blowback design using springs and the mass of the breech would require truly massive parts, and very powerful springs. One solution is to use roller locked breech mechanism, like a CETME or G3. This is a retarded blowback system, which still requires stiff springs to help control the eventual release of the breech block. It's a funky way to get it done, but the G3 was widely adopted.
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