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Albert, the barrel is exactly 3.9". ((Specifications and Features)): - SIG Sauer P320 Nitron Carry Semi Auto Pistol 320CA-40-BSS - .40 Smith & Wesson - 3.9" Barrel - SIGLite Sights - 14 Round Magazine - Modular Polymer Frame (Matte Black Finish) Stainless Steel Slide (Nitron Finish) - Striker Trigger System - M1913 Accessory Rail - Sight Radius 5.8" - Overall Length 7.2" - Overall Width 1.3" - Overall Height 5.3" - Overall Weight 25.8oz - Matte Black Finish.

3.9 inches Albert. You picked a nice pistol.