I'm having the same problem, I tryed a cheap one that says fitts all but the gun still fell out so still looking out for one but I might have better luck, I've got the 3.5 inch compensated barrel. It's not that bad a holster for the price but for the S&W it's crap.
http://cgi.ebay.com/HDN-TAC-Nylon-Pi...QQcmdZViewItem
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Certified Level 2 BA Sniper
Si ton épée est trop courte, allonge la d'un pas. ( Proverbe Hongrois )