I have a Guardian in 9mm and I love it.
I did have some problems with the factory mags as they would launch a live round out of the slide at the same time as it was ejecting a case. I purchased some new Checkmate mags and the problem went a way.
I love the way that the gun carries as it is super comfortable in a IWB and what was surprising is that when I carry it in a Galco Miami Classic shoulder holster I forget that it is even on
The gun shoots like a dream, I can hit anything that I aim at and in very tight groups.
The only complaint that I have is that the extractor is not blended very well at the back of the slide. Sometimes I wonder if the gun shop sold me a blem.
As far as the CCO........ I will let you know in a couple of week.