ISSC Mk 22 Can’t afford a real FN-SCAR? The ISSC Mk 22 is a look-alike clone in .22 LR but obviously has minor exterior differences from the real thing. As neat as it looks, the gun itself is basically a GSG-5 in a SCAR shell. They are a little problematic but it’s common in semi-auto rifles in .22 LR to have failure to feed, eject or light primer strikes. Personally having gone through 5 semi-auto .22 LR rifles, I’m sticking to bolt-action ones to avoid headaches.