Ruger RXM Threaded Barrel 9mm Luger 4.5in Black FNC Nitride/Stealth Gray Pistol - 15+1 Rounds - Built around a removable stainless steel Fire Control Insert housed in a Magpul Enhanced Handgun Grip, this modular platform offers Gen 3 compatibility with common parts, holsters, and accessories. The EHG grip features Magpul’s 3/4-scale TSP texture with indexing pads, a flared magazine well, beavertail, and undercut trigger guard for consistent handling, along with a universal accessory rail for lights or lasers. A 1/2 x 28 threaded, precision-rifled alloy steel barrel with FNC nitride finish includes a factory thread protector, and an additional 18lb recoil spring assembly is provided for tuning with different ammunition setups. The optics-ready slide supports direct mounting of RMR, DPP, and RMSc footprints, paired with co-witness steel sights and a tritium front dot. Striker-fired with a flat-faced trigger, extended controls, and integrated safety features, this platform balances adaptability with practical design. Made in the USA ; 1/2 x 28 Threaded Barrel with factory-installed thread protector allows for the attachment of popular muzzle accessories.; Removable serialized stainless steel Fire Control Insert (FCI) set inside an interchangeable Magpul ®  Enhanced Handgun Grip (EHG™) for enhanced flexibility and customization.; Most major components are designed for Gen 3 compatibility with off-the-shelf parts, holsters and accessories.; Magpul EHG features Magpul's 3/4-scale TSP texture for a secure grip without discomfort or damage to clothing during concealed carry and textured indexing pads for consistent finger / thumb placement.; Other EHG features include: a low-profile, flared magazine well for quick and easy magazine insertion; a trigger guard undercut and beaver tail that promote a high grip for better control; a magazine release scallop for easy access; and a universal-pattern accessory rail for use with a variety of lights and lasers.; Additional heavier 18lb guide rod / recoil spring assembly that can be used to help tune the pistol to your chosen suppressor and ammunition.; Extended magazine release and raised slide stop.; Slide allows for direct optic mounting of RMR, DPP and RMSc pattern optics. Co-witness-height steel sights feature a tritium night front sight, providing an excellent sight picture, with or without an optic installed.; Striker-fired with a flat-faced trigger, smooth trigger pull and tactile reset.; Precision rifled alloy steel barrel with FNC nitride finish.; Safety features include integrated trigger safety and internal striker blocker.;