Think about it. This is not a gun rights issue. It all about safety. Would you really want your neighbor having a gun and no clue how to use it safely, or even hit what he's aiming at? We require drivers to take a driving test and get a license. Why should guns be any different?
BTW, I am totally pro 2nd amendment. I just want the ones who own those guns to know what they are doing.
Would they be willing to remove some of the current restrictions on the types of guns and accessories in exchange for the training? My guess is no, they would want more restrictions plus the training.