Just bought a like new G3 clone/ Fed Arms receiver. Ran a bunch of ammo through it last night.  Seems very accurate and recoil isn't bad.  The rear sight is pretty far to the right, but seems to be on, windage-wise.  Groups were a tad low, which should be expected at 25yards (Winchester 150 gr.).  Anyway, I like it and it seems to be pretty functional.  I had a couple questions though..

Where to get the cheapest surplus ammo?
Anyone use optics with these things?
Anyway to lighten the trigger?

Regards,  -Coop