High pitch whine when firing

[DrChong]

Whenever I hit the fire button on my v2 r4 there's a weird whining noise, it works flawlessly, no problems at all apart from this noise, it's drivin me crazy!!

Any help would be really appreciated.

Thanks
John

 

[kiwivap]

John, what is a v2 r4?

 

[mgmrick]

A rba will do that if center post not making good contact with rba