I don't have a wasr, but I've suppressed a bulgarian arsenal rifle and a wbp pistol. Both are hosts for nomad-L w/ keymo. Something like a 9mm can or a wolverine would be even more forgiving of alignment issues but it might not be necessary.
- Arsenal was a project based on a ban-era gun with no muzzle threads. I had CW Gunwerks put on an adjustable gas block and thread it 1/2 28 and pin/weld a keymo flash hider. Turned out concentric and the gun is pretty much perfect. 122/154/196 gr projectiles all produce very different pressures at the gas port. 196 = setting 3, 154 = setting 5, 196 = setting 7. This gun has slightly less than normal barrel past the gas block (it's basically a 13.7 plus muzzle device)
- WBP was a gun with a welded on muzzle nut which I dremeled off and replaced with a JMAC 14x1 keymo brake. This also turned out concentric with no mods and I've shot it a bunch of times. 122 is reliable but smoky, 154 feels perfect and 196 is a bit on the weak side in terms of ejection force. Keep in mind there is like an inch of barrel past the gas block.
My takeaway from these projects was that:
Any AK can be suppressed, just use a bore rod to verify.
Best results will be with adjustable gas block, especially if you plan to use a bunch of different loads and want things dialed in perfect with each one.
Getting a muzzle device timed perfectly on an AK works best if you have a machine shop do the fitting.
Considering the effort involved (ie pressing stuff in and out vs pulling pins and swapping in an upper on an AR) and the relatively low cost of new AK barrels, I don't think there is much of a downside to pinning/welding on AKs.