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The Stealth Operator Twin Mag fits double stack magazines for most Glock handguns, such as 9mm models (G17, G19, G26, and G34), .40 caliber models (G22, G23, G27, and G35), .45 GAP models (G37, G38, and G39); and .357 SIG models (G31, G32, and G33). In addition, it fits hundreds of other magazines using similar dimensions.