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
Century Arms AR-15A2, 5.56
1946 Mosin-Nagant M44, 7.62x54R
1978 YUGO SKS, 7.62x39
NEF Protector Pump, 12 gauge
Savage Model 64, .22LR
NEF Pardner Tracker II, 12 gauge
Rock Island Armory 1911A1, .45 ACP
Remington 870 'Express Magnum' 12 gauge
Bersa Thunder .380
Last edited by dragunovsks; 11-13-2011 at 04:18 PM.