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I can answer this as my wifes owns a P99AS 9mm. In Canada, it is sold with a 106mm barrel and sticks out by about 5mm past the end of the slide. Looks okay. The manual has a sticker over the original 102mm length. I did have to dremel the end of the Blade-tech holster I bought her for it though so that the gun seats properly. Great gun by the way. You may also want to look at the M&P which I have - very similar qualities and features. The M&P was about $300 less than the Walther. The Walther is very well built....she's only let me shoot about 20 rounds through it!