Sounds like you got it set for single fire mode, there is a knob that holds down your ladder sight for the grenade launcher. It must be cocked to the left to enable semi-auto mode. With the knob pointing vertical it funnels all the gas to propel the rifle grenade.
You've basically just got the semi-auto function of your rifle turned off
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Last edited by dragunovsks; 11-13-2011 at 05:18 PM.