PTR Industries 91 PDWR 308 Winchester 8.5in Matte Black Parkerized Modern Sporting Pistol - 20+1 Rounds - All of the great features of the 51P pistol, with the addition of an aluminum M-LOK handguard for the mounting of additional accessories, such as lights, lasers, and foregrips. Caliber: 308 Winchester, 7.62mm NATO Operating System: Roller-Delayed Blowback Semi Automatic Barrel: 8.5in Stress Relieved, Heavy Contour, Threaded 5/8in x 24, Twist 1: 10 RH Optic Ready: 7.5in Steel Picatinny Rail Mil-spec anodized aluminum M-LOK Trigger Pull: 9-10lbs. Includes: Gun Case, One 20-Round Magazine, Gun Lock