Timber Creek Greyman AR-15 Lower Parts Kit everything you need to finish an MSR build with upgraded components and a tactical aesthetic. This kit includes ambidextrous controls and mil-spec hardware finished in black, built from aircraft-grade billet aluminum and steel for long-lasting durability and reliable performance. Product Details Brand: Timber Creek Item: Greyman AR-15 Lower Parts Kit Finish: Black Material: Aircraft-grade billet aluminum & steel Includes: GM ambidextrous safety selector GM AR takedown pins (steel) GM magazine release button Mil-spec bolt catch Springs and pins required to complete a lower build Safety Features: GM Ambidextrous Safety drop-in replacement for OEM selector with modular aluminum levers and selectable 90 or 45 short-throw configuration Pins: GM Steel Takedown Pins CNC machined steel, drop-in replacements for Mil-Spec lowers to allow easier disassembly Design: Patent-pending cross-hatch texture for improved grip and a modern look Compatibility: Fits Mil-Spec AR-15 lower receivers Use: Ideal for MSR builds, upgrades, and replacements