Today I installed a few parts from HB Industries in my CZ Scorpion.
The first and easiest was an extended charging handle on the right side. Installation required drifting the handguard pin to the left, sliding in the new charging handle, and returning the pin to its original position.
As you can see, the new charging handle provides a much larger gripping surface.
The second part was an extended paddle magazine release. I'm really glad that HBI included a spring with it because I managed to drop and lose the OEM spring.
Finally, I installed HBI's reduced power trigger and disconnector spring kit. This required the most work but I had it done in under a half hour. While I had the trigger pack apart I took the time to polish the engagement surfaces with hard Arkansas stones. I also put a bit of Teflon-bearing Superlube grease on the contact points.
Incidentally, HBI has some very well done instructional videos on their YouTube channel.
As it came from the factory the trigger pull was at least 9 pounds. Now it's about 5.5 pounds and much smoother.
These are small changes but should make shooting the gun better.