Can't find any recent pictures, but I have a Gemtech HALO that I use on a Bulgarian sidefolder 74 build. Vltor made an adapter called the HALO-74 that attaches to the 24mm threading and replaces the HALO's collar. I've fit it on my SLR-106 rifle and pistol but unfired. Works great on the 74 though.
I've cooked up an adapter that will let me put my AAC SDN-6 on a 24mm thread but I haven't tested it out yet. I think it'll be fine on the 5.56/5.45 rifles, but I don't know that I'd trust the tolerance stacking for the 7.62 rifles.
There's a lot of folks that think unless you can achieve 100% optimal results, it isn't worth suppressing. The AK leaks gas all around the dust cover and through the recoil spring rod opening. You know what? I don't care. It's fun. Maybe it isn't as quiet as some gucci-gear AR, but it is still a lot quieter than before!
Though to my ear, a 16" AR sounds pretty close to the 16" 74 barrel. I've used it with an AUG as well, which is definitely a lot louder than both.