Future Energy Hong Kong sent in news over the weekend about their latest upgrade parts for the VFC/Umarex MP5 Gas Blowback rifle. Both items are CNC'd with one being made of aluminium and the other steel. Check more on the links provided below and there are more upgrade parts available at the website for the GBB SMG.

For VFC MP5 GBB Upgrade parts, CNC Aluminum Loading Nozzle

For VFC MP5 GBB Upgrade parts, CNC Steel Pressure Shank for Hammer