The new setup...
WGP 2005 Superstock body with stock internals:
+ CCM Shorty pump handle with CCM return spring
+ CCM 45 Frame
+ Auto Trigger
+ 12" Stiffi
+ Karnivore Regulator
+ SL66 ASA On/Off
Sportshot is "Pumpenstein" modded to feed more reliably, which is probably not too hard to do, just time consuming, so I just bought one from them.
I cut down the feedneck a bit to get a lower profile.
Here's a pic showing the difference in sizes between the regular pump handle and shorty handle:
