The Shadow Systems MR920 Foundation combines refined ergonomics with an optics-ready design and a Holosun 507C X3 red dot included. Built on the Shadow Systems frame platform, this 9mm pistol features wraparound grip texture and interchangeable backstraps to provide a secure, customizable fit. The Foundation slide features pocket-cut serrations and an optic cut designed for direct mounting of most major optic brands. Steel sights pair a black serrated rear with a white-dot front, providing a lower-third co-witness with most optics. A match-grade nitride barrel, carbon steel guide rod, and drop-safe polymer trigger round out the design. The package includes two Magpul magazines and three interchangeable backstraps. Specifications Manufacturer: Shadow Systems Model: MR920 Foundation Caliber: 9mm Frame: Black Foundation frame Slide: Foundation slide with pocket-cut serrations Optic: Holosun 507C X3 Red Dot Optic Mounting: Optic cut for direct mounting of compatible optics Barrel: Rifled, match-grade nitride steel Ammunition Compatibility: Rated for +P ammunition Sights: Black serrated rear and white-dot front Guide Rod: Carbon Steel Trigger: Drop-safe polymer Grip: Wraparound texture with interchangeable backstraps Included Magazines: Two Magpul magazines Included Backstraps: Three interchangeable backstraps Holster Compatibility: Glock 19/19X Gen4 holsters Get it at BattleHawk Armory!