Howdy Again Amigo!
You got some great information from folks here already, and especially the specifics from Gunslinger. Those are some tidbits that will guide you to more reading.
But something I neglected to mention is that I have been open carrying for awhile now. I've been all over the front range, from Colorado Springs to Brighton to Burlington and plenty of places in between. Among the towns where I've travelled without incident are Silverthorn, Kremmling, Aurora, Thornton, Northglenn, Security, Colorado Springs, Golden, Commerce City, Highlands Ranch, Lonetree and a whole bunch of other places too. In addition, I've carried open in other states such as Kansas and Nebraska. I hold a CCW permit, but often prefer to open carry one of my various sidearms.
Obviously, from the above paragraph, I've had plenty of opportunity for an LEO encounter. I know for certain that several Aurora officers have seen my pistol mounted on my hip. I also know that an officer in Commerce City was clearly aware of my pistol at a 7-11 around 3:00am after I spent the night doing a ride-along with a sheriff's deputy. An officer in Burlington saw me carrying and his only response was to return my friendly wave as he drove by.
I've finally come to the point of this whole novella. I haven't yet had a single incident with an officer over my firearm. Not one officer has made any fuss over it, asked any questions about it, nor given me any static whatsoever. Any close encounters of the LEO kind have been uneventful or downright cordial. In one or two instances, I've had security cops compliment my decision to exercise my 2a rights and we ended up talking about what sort of firearm we carry, good places to go shooting, and other topics related to our experience.
So for whatever it is worth, the prospect of an LEO encounter may be much worse in apprehension than reality. Yes, some folks have endured some pretty outrageous encounters. I'd suspect they are in the minority. I'd figure an uncomfortable encounter would be rare, but sometimes do happen. Being prepared with an understanding of various laws, court decisions and suits filed against unlawful detention or inappropriate LEO behavior is helpful when undergoing such an encounter. The best defense is knowledge. Regardless what calibur bullets you carry, the best ammunition you can have is specific knowledge as appropriate to state your case. Remember the onus is on the officer in such encounter to justify his actions. So long as you are peacefully carrying and not making a disturbance of some sort, you are within your rights as a citizen of the State of Colorado.
Good luck, and carry on!
Blessings,
M-Taliesin