Have you messed with the LPR at all? If the bolt is cycling but there is no "shot" then the LPR is too low (HPR too high) so the ram isn't able to open the valve.
It goes bang, but not POP!!!, from the sound of the ram smacking the pin but not opening it.
As for the Pin, degass it and push the bolt with your fingers, you should feel when the ram meets the valve pin, then be able to press a little more to open it. If you don't feel that, then you are not connected.
I cant take pics of mine if you need something.
I like Spyders.
MR1, MR2 LP, EMR5 LP, EM-1, Raven Primal, Victor, Fenix.
Magfed Hurricane with T15 Mags