upgraded ca g36 not firing in full auto
 

when i switch to full auto the trigger refuses to move and if it does it will only fire in semi, and about 5-10% of hte time it will go full auto for a bit. the upgrades it has are as follows.

Mad Bull Polycarbonate Piston (Full 7 Steel Teeth)
Mad Bull M110 AEG Upgrade Spring
Modify Aluminum Bearing Piston Head
Modify Bearing Spring Guide V3
Modify Air Seal Nozzle G36 Series
Modify Enhanced Tappet V3
Modify Anti-Reversal Latch V2/V3

any help would be great XD.