[ThunderCactus]

As far as electronics, a PTW is about as reliable as any AEG with an SW-COMP in the rain.
My G&P 249 and M4 work 100% in HEAVY rain, whereas most people's SW-COMP AEG's fail miserably in just light rain.
As long as you're not dragging a PTW through the water or over-exposing it to the rain, it'll be fine.

And range is only minimally important to range and accuracy. You need the proper weight of ammo to fully take advantage of high FPS, I've made some pretty lengthy posts about it.
Fact is, the heaviest, while still being economical, BB on the market is the .30, and the maximum velocity you can accurately use a .3 at is about 440fps. Anything beyond that and you REALLY need a .34 or .36 to take advantage, otherwise you start LOSING accuracy.
I run my VSR-10 at about 430fps, and it's a freaking laser beam out to 240 feet, and can hit targets out at 300. Hell I've seen 330fps guns that were accurate out to 180 feet!
The two main deciding factors in range and accuracy are compression, and hopup. Get those two working 100% and you'll have superior range and accuracy from 300-480fps as long as you use the right weight of BB.

That being said, an AEG is specifically engineered to be fairly easy to produce. A PTW is specifically engineered to be a good shot.
And you CANNOT compare a PTW to a bolt action sniper rifle, or a GBBR, because they are TOTALLY different systems. It would be like comparing a 4 door sedan to a race car.