you wont get any conversion parts easily at all...you're better off just buying a JG SiG 550 like I did. That way you can carry both
. You can buy a JG SG550 for $88 on gunnerairsoft.com. It comes with a 9.6v battery and does 350 fps right out f the box, so it will actually out perform our SiG552's lol. I am actually waiting on mine to arrive, so I'll tell you how it is before you make a decision.