Decades: 320s BC 310s BC 300s BC 290s BC 280s BC - 270s BC - 260s BC 250s BC 240s BC 230s BC 220s BC
279 BC 278 BC 277 BC 276 BC 275 BC - 274 BC - 273 BC 272 BC 271 BC 270 BC 269 BC
... as the AR-15/M-16, designed by Eugene Stoner, integrated the piston with the bolt. Others, such as the M15 and Kalashnikov[?] patterns, attach the piston to a bolt ...
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