Reason I ask is that I am pretty sure that if I hang a VFG on a semi-SP89, semi-GSG5 pistol, or a semi-MAC pistol - I'm gonn have to pay $200.00 for a F1 conversion.

Does this sound correct?

But if a CL2/07 mfg makes such an AOW, I can buy it with a $5.00 F4 fee, correct?