Hi!
Something about FPS; range depends more on the barrel and hop-up than the fps. One of my friends with a stock CA M4CQB-R (about 280-290 fps) with a good barrel and hop-up shoots for about 50 meters (plus he realize hits
)
Many time I see people with "chinese wonders", upgraded to 450-460 fps - and accurate for only 20-25 meters...
For the BB; the heavier bb is more good for the stability outdoors; for sniper jobs, I use a CA M24, usually with Maruzen APS Super Grand Master 0.29g BB, and I'm very satisfied with it, Madbull 0.40 BB (green color) is also very good (but a bit heavy
)
I highly recommend H-Hop Up Spacer too.
Best regards;
Shark;
Viper AS Team; Hungary