ok so I got a new VFC Scar about 2 months old and have not been able to actually take it out till last weekend. Its worked great all day, till at the very end while clearing the chamber it just stops working. I pulled the bottom receiver off and see the piston in the locked back position. I am thinking its the piston but before I pull it apart does anyone have any other ideas it might be? I tried to fire it in Semi and nothing then auto it fire like 5 shots and then nothing. the motor is working as I checked that. tried a fresh charged battery. and still nothing. I will not be able to get into the gear box till this weekend. so I am open to hear thoughts on things to check.