Gave one of these a try on my Beretta Storm Sub Compact and a FS Storm, very stable under a belt, connects with a VERY SOLID snap to the rail, you can see the release tab in the image from Desantis. I'm a lefty so under the belt over the pants at 6:00 worked just fine for me. Amazon Prime has them for $17.40, going to buy another :top:
Amazon.com: DeSantis Rail Ryder: Sports & Outdoors
Rail Ryder®; DeSantis Holster
Amazon.com: DeSantis Rail Ryder: Sports & Outdoors
Rail Ryder®; DeSantis Holster