IWI Masada Optic Ready 9mm Luger 4.1in Black Pistol – 10+1 Rounds – The Israel Weapon Industries Masada is perfect for anything from defense to target practice. This 9mm handgun has a 4.1-inch barrel and comes with two 10-round magazines. Finished in black, it features 3-Dot night sights, three interchangeable backstraps, and fits a variety of hand sizes. It also comes optics-ready with 4 optics plates that allow the optic to mount directly onto the slide.