Can't get this anywhere else
This right here is flexibility. If you're coming into a S2 from a plastic gun you may not want an extra 12oz into your frame. You can do this with the right amount of inserts. If you want the full 12oz then go for brass grips and the inserts. They're great. Tip: don't put any Loctite on them. They need to fit flushed in somewhat tightly. Just set them in and leave them there. If you have any issues with them, get in touch with SSI as they'll most certainly take good care of you.