Just to let u guys know:
1. systema V2 reinforced standard ratio gears work in FAMAS.
2. V2 bore-up kits can be used! the V2 cylinder is 3 mm longer then famas stock, but if the cylinder head can be pushed a bit into it it fits with no modding.
What does require modding is the cylinder head, since FAMAS tappet-plate is wider then V2 tappet's, u need to grind it so the tappet will fit.
And you need to find a bore-up nozzel that fits..