Hey guys I'm considering getting a used Kwa MAC-11 NS1 for $75 shipped with 2 mags. So there's not a lot of infromation on this gun so I was wondering 1. What is the ROF 2.What kind of range does it have? 3. How does the gas effieciency compare to the NS2 version?. and 4. How solidly built is it and can I expect it to last a long time? And do you guys think that this is a deal that I should take? Or should I save up and buy the NS2 version? I would really appreciate if you guys could answer quickly because I want to give this guy an answer by tonight.