cocker question

[rehme]

i am getting a cocker preatty soon for a good back up gun the spyder does not do the job any more but i want to know does a vertical feed cocker get blow back because i might buy a 12v and a new tank for it if it does i will just put my halo b on it but can someone tell me

[AGDmagman2001]

if it's timed right you shouldn't have a problem with it.
2 tests are
stack the balls in the feedneck as high as you can get it without them overflowing, and shoot, the top ball shouldn't fly out
or
get a small piece of tissue paper, and sit it on the feedneck and shoot, it shouldn't blow off

[Venom]

The trick is to get the valve to shoot right as the pneumatics are operating, this creates suction which pulls the ball into the chamber. It's a neat side effect with cocker timing, and any cocker can do that. Cockers can shoot with ball suction, a little blowback, or neither.