100 Concepts emailed stating something I ordered is delayed because they're changing the design to transmit more light and something else "positive." It sounds curiously like they're complying with something.
This is one of the cheek risers for the CTR: Mathews Fabrication
And then you can add the Arisaka buttplate kit. Then you've probably spent more than a PRS stock but it's adjustable for LOP.
The new Magpul DT spec stocks are marketed as having the latest and greatest lockup feature. There are a few aftermarket items for the CTR that make it very adaptable so it's worth checking out.