I received the extended mag release from CGW today. The finish looked OEM and I couldn't tell that it was a modified part. David really does us a great service with his custom work and drop in parts for CZ's.
Installation was simple. You don't have to pull the sear cage or trigger bar as there is enough clearance to get the screw out with the hammer down. I would recommend that you don't pull the mag release spring all the way out, just pull it up enough to get the mag release to slide out of the frame. Make sure to tighten the spring retention screw tight. I didn't use locktite as the screw had detents on the head that grabbed the frame when you tightened it. We'll see how it holds up. I have the position noted so I can keep an eye on it.
Some Spec's:
Stock mag release protrusion from frame: 0.055 inches
Ext mag release protrusion from frame: 0.195 inches
Some pictures:
Stock doesn't protrude past the grips:
Extended protrudes quite a bit:
So far I haven't played with it much, I just installed it. With the limited dry fire practice I think I am going to like this setup. It feels like my SP01 now just a little larger. I don't have to shift my grip at all and I easily get enough force on the button to drop mag's. It looked like it protruded out too much at first but it doesn't seem to get in the way of the grip at all.
Cheers,
Toby