Both of these models are identical except for caliber. Introduced in 1995, these are subcompact versions of full-size Glocks. Model 26 chambered for 9mm cartridge; Model 27 for .40 S&W. Magazine capacity; 9mm 10 rounds; .40-caliber 9 rounds. Overall length 6.25"; barrel length 3.5"; height 4.1875"; width 1.25". Weight for both models about 20 oz. Standard are a dot front sight and white outline rear adjustable sight. Available with OD green frame. NOTE: Add $25 for Gen4; $50 for Gen5 MOS (Modular Optic System).