Unlocking system for semi-automatic weapons comprises piston connected to cam and operated by gas from channel which opens into barrel, ensuring that weapon can only be opened when gas pressure from firing has fallen to safe level
摘要
<p>The unlocking system for semi-automatic weapons comprises a piston (4) connected to a cam and operated by gas arriving through a channel (5) which opens into the barrel. This ensures that the weapon can only be opened when the gas pressure from firing has fallen to a safe level.</p>
