I'm not into side chargers, but if I was, I'd probably get a JP setup.
I built all my small frame AR's except one, a limited edition Noveske, and I may get KAC uppers for the few KAC lowers I have left. But for every other AR I built, I used the JP small parts kits and the JP FMOS carrier on all but a few. The small parts are quality and the carrier, well, it's slick as goose shit and eliminated any reliability issues.
They just make very well made stuff, mostly cater to the competition crowds, 3 gun, match, etc. But some of their parts are simply the best made regardless of the use and I consider those carriers to be peerless.
Is there a reason you want the side charger? If you just want it, get it, but I use those PRI gasbusters due to suppressors, but they have large, long levers that make it easy to charge with one finger even if the scope is in the way. Very well made and those are on sale through PRI until end of the year/first of next year for a pretty good price. Don't know if that's an option but I figured I'd mention it.