Yes. They will since they're standard mags.
That being said, some people have feed problems with KA mags which required a very small, easy mod to get them to work. Personally, I've never experienced this issue. I use KA 68 round mags almost exclusively in my C7A2 (CA M15 based), custom C8A2, and JG HK416. I haven't experienced any feed issues with any of them that regular mag maintenance (silicone oil) couldn't fix.