The Guntec USA BAR-4.5-9 barrel is engineered for superior accuracy and durability, elevating your 9mm caliber firearms to new heights. Constructed from premium 4150 chrome moly vanadium, this compact 4.5-inch barrel is designed for optimal performance, weighing just 9.4 ounces. Its robust black nitride finish not only enhances its aesthetics but also provides exceptional corrosion resistance. 4150 Chrome Moly Vanadium Weight: 9.4 oz Compatible with 9mm rounds for optimal performance Chambered in 9mm Cal 4.5 Length 1:10 Twist Straight Profile Durable Black Nitride Coating 1/2 by 36 Thread compatibility Optimize your shooting experience with the superior Guntec USA BAR-4.5-9 barrel.