RS USMC M249 MKII Stock, works with VFC M249 GBB

Bought this on impulse, didnt use it once when i learned that the VFC one and RS werent compatible with each other.
Pretty sure that this is one of very few in Europe.
Was expensive too. 
It will lower your ROF and lessen you cooldown on your VFC M249 GBB. 

Asking 250€ + shipping.