Tanned Poseidon Avenger+ With Meduse ETU & Integrated Tracer

I brought this gun off someone before they upgraded the motor and spring they said It’s in good cosmetic condition it sort of works so it shoots fine then sometimes dry fires and BBs just roll out the end of the barrel then starts working again then stops working no idea what’s wrong with it can’t be asked to put money into it to get fixed as I have other guns this gun is for a gun tech guy or girl comes with a kwa handle another motor and spring and the original mag Collection Orpington or can post if you buy a prepaid post note yourself so I can drop off at the post office