Gen4 Glock 27 .40 Smith & Wesson 3.47 Inch Barrel Black Finish Fixed Sights 9 Round Glock 27 Gen4 Features fixed sights, interchangeable backstrap, revisable magazine catch and Dual recoil spring. Safe Action trigger system with three safeties. Right hand, hexagonal barrel rifling. Tenifer surface treatment process for barrel and slide.