The Luth-Ar Rifle Kit Bull 16 W/ Adj Stock is a complete AR build solution designed to deliver precision, reliability, and customization for enthusiasts looking to assemble a high-performance rifle; this kit includes a fully assembled 16 inch fluted bull barrel upper with a vented 15 Keymod palm handguard, paired with your choice of either the MBA-1 Fixed Rifle Buttstock Assembly or MBA-3 Adjustable Carbine Buttstock Assembly, and a full lowerParts kit to streamline assembly while offering robust compatibility with Mil-Spec components, though the lower receiver must be supplied separately. You can further enhance your build with optional add-ons such as a Velocity Drop-in trigger or The Lower Enhanc-AR Kit to tailor the feel and trigger response to your preferences. The upper is chambered in .223 Rem with a 16 inch 416 stainless steel bull barrel, threaded 1/2 x 28, a .936 inch gas block, a 16 inch gas tube, and a 6 groove M4 feed ramp, delivering dependable performance and easy maintenance. The package also ships with a complete LLRPK-1 lower receiver parts kit and an assembled upper with the HG-V-15K palm handguard, ensuring you have the core components needed to complete your AR once you supply a Mil-Spec stripped lower receiver.