I’ve held off buying the RIA CCO 9/TCM9R combo for years because I didn’t want to deal with stocking both base TCM and TCM 9R. In fact there is a post here on THR from back in 2017 where I lament that the CCO is 9R. However, I ran into some info that raises questions. Apparently the Armscor CCO frame will hold a standard .38 Super mag just fine. The .38 super mag works fine for full length TCM. So...is the CCO combo marked as 9R because it really needs 9R to work reliably, or because the flush 8rd magazines they sourced are 9mm length? In searching online, I found one vague reference to an Armscor/RIA employee saying they used standard TCM in the CCO, but the source had no info about how that was done. Edit: for those that don’t know: The TCM and TCM 9R are the same cartridge, with different bullets. The 9R bullet is loaded to give a shorter OAL to fit in 9mm magazines.