http://www.rcuniverse.com/forum/fb.asp?m=3489012
http://www.rcuniverse.com/forum/fb.asp?m=3447216
http://www.rcuniverse.com/forum/fb.asp?m=3310020&key=
Take a look at those.I am one of the first users of SK.Im impressed and happy to have them.(Both .50 ABC and .80 Ringed).
My .50 has just begun its duty on a trainer and Im so happy with it as u can read my comments on those threads.
Strongly recommend to buy it while still so cheap.