This complete caliber X-CHANGE kit allows you to convert your manual safety 9mm P320 to the civilian version of the U.S Marine Corps’ M18 featuring the ability to mount the ROMEO-M17 reflex sight. – The SIG SAUER M18 is the official sidearm of all branches of the U.S. Military and the official sidearm of the U.S. Marine Corps. The commercial M18 brings the same unprecedented accuracy extreme reliability and unmatched durability the military demands. – This kit includes: – (1) 17-round magazine and two (2) 21-round magazines. – Full-size 3.9 Coyote-tan PVD coated stainless steel slide. – SIG-LOC MHS footprint capable of accepting the ROMEO-M17 Red Dot Optics. (optic not included) – Equipped with a SIGLITE front night sight and a removable Night Sight rear plate. – Coyote-tan carry-length grip module. – 3.9 Barrel and recoil spring assembly. – Model P320 M18 – Category Conversion Kits – Color Coyote Tan – Accessory Rail M1913 – Caliber 9mm Luger – Mags Included (1) 17rd / (2) 21rd Steel Mags – Magazine Material Aluminum – Barrel Included Yes – Barrel Length 3.9 in [99.06 mm] – Threaded Barrel No – Recoil Assembly Included Yes – Pistol Size Carry – Sights SIGLITE Night Sights – Optic Ready Yes – Grip Color Coyote Tan – Manual Safety Yes – Grip Material Standard Polymer