I have the opportunity to purchase two what I believe to be older CF380's as a package deal, but would like some advice from someone with more knowledge than me, which is to say almost anybody. 1. The reason I believe them to be older is that they have smaller front sites and fixed rear sites. Is this a correct assumption and approximately what period of time were these manufactured? 2. They both have composite frames as opposed to aluminum, but. Instead of being black the frames are a light grey in color. Special models, freaks or is this how they were once made? 3. Lastly, with an empty magazine installed, when you pull back on the slide it doesn't lock open (last round hold open). Is this how the older models were made or has someone broken/modified these? Thanks in advance for any light you can shine on these questions.