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A lot of the dealers listed above sell them. I saw the on Irunguns site also. For any kind of accuracy you will need to use the mag cylinder as the bore is .224 compared to a .223 for LR. And man are they loud.
I like the .22 WMR round. It is expensive but fun to shoot. I would recommend a longer bbl. on the gun as the WMR is a rifle round and not optimized for short bbls. I bought it as an alternative to the hot 5.7mm round, almost as fast and way, way less $$ for ammo.