Should just have a bolt handle on the side, like every other battle rifle worth its salt.
While this wasn't applicable at the time it was designed, the rear charging handle is a serious benefit with modern optics and accessories.
I have access to a couple of SCARs (L&H) and that reciprocating side charging handle is not as "ergonomic" for me as the rear charging handle. (Technically I am baby sitting them at my house right now
It gets in the way, you will bang your knuckles on optics when charging causing you to let go of the handle before you get it all the way back, it can get caught on chest harnesses and pull it slightly out of battery (it usually goes back but sometimes it doesn't), it pokes you when you are walking with it slung
, unless you move it to the right side.
When I first heard about it, I thought it was a great idea because my 1st EBR was an AK and I liked the charging handle. Once I got to try and use one with optics on the SCAR, I lost my enthusiasm.