Originally Posted by Ronan
An extremely powerful rifle developed for the military; capable of destroying light armored vehicles and aircraft more than a mile away.
Umm, no, that is an awful descrition of a sniper rifle. That should be the definition of an 'Anti-Materiel Rifle'.
To the poster, best you can get in-so-far as an AEG to use as a 'sniper platform' would be the TM M14. Avoid the G&G M14, it's not very well made, and avoid the CA M14, it's not very good either (and considering it uses very thin wires, if you put a heavier spring in it the motor will draw more current, and possibly burn out your wiring/fuse very easily.)
And you DON'T need to set up an AEG to shoot over 400fps, just learning to track your BB flight and watching the way it reacts in the air, as well as tuning your gun best as you can will do you just fine for a sniper platform.