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Description An affordable pistol upper assembly without cutting corners. This means using a Kaw Valley Precision Carbon Fiber Handguard, to have one of the sturdiest and lightest possible handguards on the market, paired with a 4″ Nitride treated barrel chambered in 9mm. This also means taking the time to ensure that the upper will function reliably. We use Permatex 242 on key components while using mil-spec AEROSHELL 33MS Anti-Seize grease on the properly torqued barrel nut and muzzle device. Bottom line is this: you hear all the time about guys buying a budget upper and it not lasting or having to send it back because of some hardware defect or other issue caused by a careless assembly process. That is why we use quality components and assemble each unit to the highest standard of quality. We want your upper to function flawlessly out of the box. In fact, we guarantee it will. Lifetime Warranty Upper Receiver NBS AR-9 Slick Side Billet Upper– 6061 Aluminum– Pairs beautifully with any mil-spec lower– M4 Feedramps Barrel 4″ 9mm 1:10 Twist Pistol Length Nitride     Handguard Kaw Vallley Precision Carbon Fiber Handguard Muzzle Device KAK Slimline Micro Flash Can – 1/2×36 About the Brand NBS by Gat Ammunition, LLC NBS — Our In-House Brand for Builders Who Demand Reliable Performance and Real Value. Designed for builders who demand reliable performance and real value without unnecessary hype or inflated pricing. NBS stands for “No Bullshit.” Built on Strong Industry Partnerships Through the strong partnerships Gat Ammunition, LLC has built with trusted suppliers and vendors, we regularly gain access to premium components often manufactured by or for leading industry names. By purchasing these in volume, we bring them to you under the NBS label, ensuring proven quality reaches your build at a fair price, without the added cost of extensive marketing. Quality You Can Trust Every NBS product is specified to the exacting standards we apply to our own rifles. Each component features precision CNC machining, American-made key components where it counts, robust materials, dependable steels, and durable finishes engineered for long-term reliability. These items are either sourced from reputable OEMs or carefully assembled in-house using established name-brand elements, maintaining consistent excellence throughout the lineup. Complete Solutions for Serious Builders From stripped and complete uppers to bolt carrier groups, handguards, lower parts kits, and beyond, NBS provides a unified, affordable selection that allows you to complete confident, high-performing builds. Backed by a Limited Lifetime Warranty All NBS products come with our Limited Lifetime Warranty for the original owner, covering defects in materials and workmanship. Gat Ammunition, LLC stands firmly behind these parts because, as shooters ourselves, we use and trust them, delivering honest value and gear you can rely on. NBS Limited Lifetime Warranty — For the Original Owner Covering defects in materials and workmanshipGat Ammunition, LLC stands firmly behind these partsAs shooters ourselves, we use and trust themDelivering honest value and gear you can rely on Additional information Weight 12 oz Dimensions 16 × 5 × 5 in Barrel Finish Nitride / Melonite Barrel Profile Medium Cartridge Compatibility 9mm Barrel Length 4 Gas System Length Pistol Twist Rate 1-10 BCG / Charging Handle Not Included UPC 999994497