emoty so just keep it real. 
There's no shame at all in asking the shop to inspect & clean them if you aren't sure yourself. It's much better than tackling something yourself and missing or breaking something. Way back 25 years ago I bought my first 1911, one of the Argentine Colts. I remember wanting to change some things on it, extended safety, nicer grip safety, flat mainspring housing. So I did what everyone did that didn't know any better. I bought the parts and took it apart. Youtube wasn't a thing back then, I had the odd magazine article or advertisement for reference. I was 23 at the time and had no idea where or how to find a gunsmith, no close friends that were shooters to ask for help. Long story short (I'm sure the 1911 guys know where this is going) I ended up with a puzzle of a gun that wouldn't work for weeks at a time until I was able to find a shop that said they could fix it. I took them a shoebox full of loose parts. I don't think I left 2 parts attached to each other. I wanted to know how everything worked. After all, I was able to completely strip my Glock, how hard could an older design be?
Point is, you don't know what you don't know. In cases like that it's best to let someone that does know help out or teach you. That experiment cost me some serious bucks to learn a lesson. I still want to know how everything works and like to be able to detail strip everything I own. I've learned to have patience and seek out the knowledge to do the job properly. I've never owned a CZ-75, that will change this year. I also know from reading on here not to tear it apart as soon as I get it unless I want another box of parts. The CZ wizards will be getting PM's and offers of free beer & pizzas for some hands on lessons.
The AR will mostly like jam up with even a speck of dust.
