Howdy all, I recently purchased a used Walther PPK/S made by Interarms and finally had a chance to take it to the range on Saturday. It fits my hand well but.... I found that it does not stay in semi auto mode. The first round fires and ejects, the second round fires and ejects then it goes into double action mode as if the slide did not come back far enough to fully cock the trigger. Its pretty consistant and does this every 2nd or 3rd round. I was shooting American Eagle 95gr standard ball rounds. When I got it home I stripped it and found it was a bit dirty but not terribly so. I did a complete cleaning, inspection and lube but did not get to try it again. Did not see anything obviously worm or damaged. Any thoughts? Suggestions? Will the cleaning solve the problem? Is this a "brand" issue that needs more attention? I like this piece and want to get it to work consistantly, any help will be appreciated. Thanks Vin