http://www.800paintball.com/Shop/Contro ... /SFV/30363
Psycho Ballistics Lightning, Lightning Deluxe, or a SuperBolt for $100.
Lightning vs the Lightning Deluxe, the deluxe has a double swing trigger, while the normal has a slide trigger. Both take normal AC upgrades. They are full size cockers. Required upgrade would be some form of regulator to drop the input pressure down to 200-400 psi. You can not easily upgrade the vertical feed. It's removable, but not threaded. 15 degree ASA.
Superbolt is a minicocker base. It's a copy of the dye ultralight. The back block is a p-block, and has some custom twist lock bolt. To replace the bolt you would either need to buy a new back block, or drill a hole through it, and then purchase evo style bolts (they are just slightly shorter). Double swing trigger, vertical ASA. Vertical feed is threaded, so can be replaced with a different feed neck if you want. Also requires a regulator to use.
800 paintball had a deal where you could get a lightning deluxe and a halo B loader for $150. That's what I picked up. Unfortunately they've now raised the price to $200 for the combo, so not as good a deal. The lightning deluxe out of the box was pretty much timed and read to go. I adjusted the sear to fire slightly later, and added an old WGP regulator to it. Playing yesterday with it everything worked fine.
So if you want to fiddle with a mechanical autococker, and see how they work, etc. Now's your chance to pick one up for $100.
For those of you looking for a cheap sear tripping spyder clone:
http://www.paintballgateway.com/m3drcoandcol.html
$40 for a simple electro semi only model. Pretty hard to beat.
If you have any autococker questions, not electro questions, feel free to ask.