I was always wanting to try a side-charge handle platform. Specifically, a right-hand charge handle.

Does anyone still make them? If so, who?

Yep. There are several people making them. Rainier has some on their site and also side charging bolt carriers.

All the custom smiths like White Oak Precision, Compass Lake, etc make them.

Fulton Armory makes both an AR15 and an AR10 version. I have thge 10 and absolutely love it. I wish Id gotten the 15 in the same format.

Check out Serenity Arms. The Texas patriot rifle is a side charger, left side.

eisenacharms.com/pages/why-side-charge
have one in my 458 socom and will never go back.
it gives you the option of rear or side. makes it easier to operate with a scope mounted

Fulton is still out there screwing folks?

Here's a link to some:

http://www.americanspiritarms.com/ar-15-m4-upper-assemblies/