I was looking at these gearboxs,
http://www.redwolfairsoft.com/redwol...l?prodID=18767
http://www.redwolfairsoft.com/redwol...l?prodID=18766
I game at trek more often then not and if FPS is an issue then .25's can be used to help lowwer it a little. Im also curious if they will work with the ICS MP5 A4. Any suggestions would be great as I have never really done any upgrades before.