I would think KKM would do it for you. I've had several and some have slight differences, like the G21 4.6" wouldn't chamber an XTP unless it was loaded 1.235" or less. The one I have now, the 4-port version G21 will accept an XTP loaded to 1.260". My 6" G24 barrel thankfully will accept my warm .40's loaded with 200gr WFNGC Beartooths to 1.160"+, I'm actually limited by my mags not my bbl, but that may not be the deal with all of them.
Last edited by SDGlock23; 12-11-2012 at 08:26..