What's a Sticky Holster? Since our inception, we have developed these holsters into a modular system, where you can use it IWB, in the pocket, on your ankle using our ankle rig, and for police officers, on their tactical/armored vest, etc. They don't come with clips or loops to secure it in place, as the outer "sticky" skin adheres to your waistband, undergarments, and/or your skin. The outside skin is a super non-slip material that, with a little pressure, adheres to just about anything. That outer material combined with the inner closed-cell foam and the inner liner keeps your pistol and the holster securely in place. In the pocket, it works like any other pocket holster. However, when you pull the gun, the outer layer grabs the inside of your pocket. Our modular products use the same "Sticky" material against itself to hold the holster and gun in place. In addition, with use and body heat, your Sticky Holster will conform to your particular gun, making a custom fit. THE MD-4 Gen 1 fits Sub-compact Medium Frame Double Stack Autos up to 3.8" barrel, such as Glock 26/27, Ruger SR9c, Taurus G2 and other makes/models with similar frame sizes. MD-4 Gen 1 Fits the Following Guns: - Taurus PT 111/140 9MM - Bersa BP9CC 9mm - Beretta Px4 Storm Sub-Comp ALL - FN Compact 9mm/ .40 - Ruger SR9c 9MM 3.5 - Springfield Armory Micro Combat ALL - Heckler & Koch P30SK 9mm/ .40 - Glock G26 9MM 3.48 - Glock G27 40S&W 3.48 - Glock G28 380ACP 3.46 - Glock G33 357 SIG 3.46 - Glock G36 45ACP 3.78 - Glock G39 45GAP 3.46 - Glock G29 10mm 3.46 - Heckler & Koch P7 9MM 4.1 - Smith and Wesson 6906 9MM - Smith and Wesson M&P Compact 9mm/.40/ .45ACP - Taurus Millennium Pro All - Ruger SR22 All - Ruger SR40c All.