When I spoke with customer service about a month or so ago, they said they weren't making any gen 2 grip modules for the 45 yet - they're working on a part to make the 45 FCU compatible with the smaller calibers and when that was ready they were going to start offering conversion kits and parts in the gen 2 style. Who knows, though, things may have changed since then and perhaps they are starting with the gen 2 grips now. I guess that would mean they would need to offer the gen 2 slide catch lever as well - unless the ones for the smaller calibers also work with the 45 FCU (they probably do, but I haven't tried it).