Any reason why you didnt get the RA TECH piece that allows you to adjust the fps? Im looking at getting an agm from them that they put a metal hop up in and with the fps piece.
And as far as o-rings go, do you think you can use the ones from your local hardware store or do you have to get something like the g&p set?
http://shop.ehobbyasia.com/gandp-mag...a1-series.html