I am selling 9x HK VFC V3-converted magazines. These have also been modified to work with all VFC GBBs that accept STANAG magazines—meaning they work in the FNC, MCX, etc. They hold gas perfectly. Asking 42.5€ per HK mag.
I have one V1/early-gen V2 mag lying around, along with a separate V3 conversion kit. It holds gas but does not engage boltlock, suspecting worn follower. 25€.
Price is fixed, 42.5€ each + shipping.