Yup, it will only make a big difference on the Hammer 7. Also, on the Tiberius guns, forgive me if this is already obvious to you, you need to have a bottomline/ASA setup to use the CART reg at all.
Mind if I ask, what model CART reg do you have (i.e. the 12g changer adapter model, or male-female asa model, etc. etc.)?
If you have the 12g changer model, it won't do you much good unless you're planning to run the Phenom or DAM on 12g, but again forgive me if this is already obvious...