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If the barrel has a serial # matching the pistol frame, then you can send it to H&K for warrantee/repair work. If the barrel is a replacement or aftermarket, the bore at the front of the slide might not be machined open enough to allow the O-ring. Some O-rings I have seen are green in color and might be a thinner O-ring. You can call H&K in Georgia and tell them your serial #, then buy some O-rings from them they say were issued with the pistol if that is the case? If they say that your pistol wasn't issued with a O-ring barrel, you have the answer!
I hope this helps...
I hope this helps...