I am just a little confused on all of the configurations. I am buying a full size, with a 4 1/4" barrel and I am guessing they didn't used to make a pro model unless you got the 5" barrel but now you can get the pro model in a 4 1/4" barrel. Would that be correct? Can you get any sight config. on a pro model now? Just not sure which way I want to go. In other words if it's worth the extra cash to go pro. Thanks.