Manual

11. Press in the gas valve catch, remove the valve by
simultaneously rotating it and pulling it forward;
12. Push the Gas piston and recoil spring forward, reaching through
the ejection port, and extract them from the front;
13. Press down the gas-valve catch and rotate the gas tube through
90
o
so that the notch on the headpiece lies on the barrel;
14. Pull the gas tube out from the front end;
Remove gas valve
Push in gas piston
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