The numerical dimensions are not sufficient to describe the FEEL of the 4516 over the 4566. The 4516 FEELS "small" compared to the 4566, but is a very robust pistol compared to, say, a Colt OACP. I would not feel undergunned with a 4516 as my primary. It's a heck of a lot more power than the 5-shot snubbies that lots of guys carry as their "only".