They charge a pretty healthy amount for the upgrades that the Shadow offers to make it a better range/target gun. Of course it's a much lower volume gun, their costs are obviously higher, etc., but it's a healthy amount IMO. Here's a video on the topic:
I thought of getting a Shadow but am VERY glad that I instead modded my 85 Combat (no firing pin block, has adjustable sights) with some CGW parts including the Ultra-Lite Kit, 6SAO trigger, floating trigger pin, and race hammer kit with adjustable sear. If you are a 75 B fan and use your gun primarily for plinking and target shooting, I can't recommend the above mods highly enough. The total for these parts was $225 delivered but they transform a great gun into an absolutely fantastic feeling/shooting gun.
I'm about to do the same mods to my 97 B and will be interested to see the results and determine if I need to remove the firing pin block to match the 85 Combat results.