Tomorrow it becomes illegal to purchase, possess or transfer a standard capacity magazine of greater than 15 rounds unless it is in your possession today. The "universal background check" laws drafted by Bloomberg's antigun lawyers and submitted by his shills in the Colorado legislature and designed specifically to entrap the innocent also go into effect.
If you must travel through Denver and Boulder, I strongly suggest that ALL magazines of greater than 15 round capacity, including grandfathered magazines, be LOCKED IN A CASE! If stopped by law enforcement in the Denver/Boulder area, under NO CONDITION agree to a search of your car, the car's trunk or any locked cases in your car or truck. Under NO CONDITION answer any questions about the content of the cases. If the heads of the IRS can take the Fifth in front of Congress, you can certainly do so with the local police. Under NO CONDITION leave a magazine with a capacity of greater than 15 rounds visible in your car or truck, or you're fair game for a search. Be polite, but be firm...in the absence of probable cause, police can't go on a fishing expedition in your car unless you let them.
Remember, the so-called "grandfather provision" is an "affirmative defense," meaning that you must make your statement of ownership prior to 1 July in front of a judge...guess how you get in front of a judge. Arrest....going to jail...being charges...having to be bailed out...big money to a criminal attorney...and, finally, a court date, where the charges will be dismissed. Do you want to risk it? And, yes, you will lose your magazine(s) and whatever guns the police manage to seize at the time.
You're going to have to make your own decision on whether to carry a CCW gun with a standard capacity magazine. Frankly, I don't think I'll be carrying a 17-round back-up magazine if I carry my Ruger SR9c, at least for the first couple of months, if my travels take me into Denver or Boulder. Recall that when BHo was in Denver, many Denver Police Department officers volunteered to be potted plants standing behind Mr. Tele-Prompter, while officers were specifically forbidden to join those of us outside protesting the visit. Those potted plants would like nothing better than to be the first to arrest an innocent civilian for an unconstitutional law.
And although I am demonstrably paranoid, I would be very, very careful about strangers inquiring about buying guns or magazines. Both the DPD and Denver/Boulder media, including the Denver Post, would love to cast gunowners is as bad a light as possible. Let's not help them along.
Effective midnight, those of us in Colorado are officially behind enemy lines. Yes, we are fighting back on many fronts, and I do honestly believe we will take our state back from Bloomberg. But for now, the chair is against the wall.