This gun is a great DMR, SSR, or Sniper starting point. I say starting point because out of the box, it is none of these things. All specialized guns require some maintenance and/or modification to fulfill their roles, and this gun is no exception. At any rate...
Muzzle Velocity - Mine came clocking 450-460 Feet per Second. This may vary per gun.
R.O.F. - Mine shoots around 13 Rounds per Second, on a Tenergy 9.6V. 1600MAH battery. Again, this may vary.
Weight - Not too light, not flimsy either.
Accuracy: A toss up. The 509mm, 6.03 tightbore barrel is wonderfully accurate, but due to the length of the barrel and the Plastic Upper Receiver, the barrel will wobble by up to .75" when moved. If you're lying perfectly still, you'll be fine. If it bothers you (as it does me), you'll need the G&G metal body. Entirely up to you.
I have added a KWA 2GX Hop-Up Bucking, which works wonders with accuracy, and use a N.C. Star Bipod and 3-9X40 Scope, which help with my DMR role extensively. I plan on purchasing a Metal Body, to alleviate the wobbly barrel syndrome, and a full stock to accommodate a larger Battery.
Altogether a great gun for the money, but needs a little help to reach it's full potential. - 4/5
Power (May shoot too hard for some places)
Magazine (my first one broke, ASGI replaced it free of charge (Thanks, ASGI!))
Rating: [4 of 5 Stars!]