Disclaimer: I don't work for SSI, or am sponsored by them, just want to help out a small business in getting the word out about these as they are new and these are the first two sold after they went live on the website and I personally think they are amazing.
New grips from Shooting Sports Innovations for the CZ. These are the Scales 4.0 modular. Aluminum with the option to add weight modules to the inside of the grips to add some weight if you want. Brass and tungsten inserts are available. Here is the weight breakdown from the SSI website.
SSI made some serious improvements just in the shape and texture of these grips over the previous Scales and Scales 2.0. They are slightly thicker at 1.41" across and the taper at the top is not as aggressive as the previous models which result in the grips filling your hands more. I don't have sasquatch hands, but somewhat longer fingers. I ran Scales for a long time, and I loved the shape but were a bit too thin up top and wanted more texture so last season I switched to LOK palm swells that were oversized by .040" on each side. The one thing I didn't like about those was the coke bottle shape that left a gap on the bottom of my support hand. These are straight all the way down which allows more of my support hand to be on the gun and the taper is much less severe and the new texture is excellent. Smooth where I want it and aggressive where I need it.
Comparison of my previous oversized LOKs to the Scale 4.0
The weight inserts, I used a small amount of marine silicon to "glue" the weight in, once dry they are still easy to remove if needed and acetone will clean up the silicon.
I have one brass insert and one tungsten insert on each of the guns, and they both weigh almost 52oz with an empty magazine and Springer base pad. I know some people will comment on the price of the inserts, but brass and tungsten is hard on tooling and with the setup costs for the small runs that are done it adds up. You don't need to run the inserts if you don't want the added weight.
Both sets fit the guns very well with no shifting or movement when screwed in place. I did have to relieve under the magazine release slightly to ensure that I could depress the magazine release fully, and talking to Nathan he said some guns may need it and others may not. The magazine release could also be relieved instead of the grip itself, it was a very minor amount. The blue and black anodized versions will be coming out in the next week or so, and when I get my blue ones for my match gun I will probably relieve the mag release if it is an issue.
I know that grips are a personal fit, and for me they really knocked it out of the park.