Cylinder Valve(GBBp/GBBr)- in order to increase the Power Muzzle Velocity. Gas Blowback Rifle or Pistols are mostly like the same. SIXmm has most of the type of Cylinder Valve available. SHOP NOW!
Does not really fit VFC Glocks unless you are brave enough to do a bit of filing where the stock touches the base of the gun. You can mitigate the wobbling by putting some tape around to make it a tighter fit. I can't speak for other models and how it fits but it does the job for now.