I've slid around on BB's before... it's not as bad as you think.. They're small enough that your boot compresses around them and still makes contact with the pavement.
But it's when you get a clump of 200 or so that take up a majority of your boot that you start sliding... lol
Wear kneepads if there's BB's on concrete... Seriously. Your knees will thank you.
Gun Technician and Tuner
Well versed in every AEG version and all major gas and spring systems.