I put a micro red-dot on it which co-wittness's nicely, used the CZ right side Saftey Delete, and SBR'd it with the CZ 922r kit ... Put a TROS QD adapter on it, then after about a year I put a carbine handguard on it to protect the suppressor.
I did put the Manticore switch-back extended charge handle on the left side, its just what I've been waiting for it's not spring-loaded. It's supposed to close with the inertia but annoying because about 1/2 the time it doesn't swing back to the closed position. Maybe it just needs a little weight on the handle. I moved the small factory one to the right side but I might switch them so I only use the switchback on an initial charge and have the small one to slap on mag changes ... I need to switch to them, run a few drills and see if that works any better for me.
I've tried a Magpul AK folding stock, but the adapter made it long enough I didn't need to extended it at all, in fact it was a bit long ... I liked the stock in the CZ 922r kit much better when I finally got one.
I'm not sure why these spring kits, extended mag releases, different angle grips are needed, but each to their own ... I've tried a few different mods but have found the way CZ designed it for the military works pretty well.