The Primary Weapons Systems AR-15 .223 Shim Set, crafted in unfinished steel, delivers precision-ready shims designed to work seamlessly with AR-15 platform barrels and receivers to achieve proper headspace, alignment, and fitment for .223 caliber configurations. This steel shim set provides the durability and stability needed for aggressive field or range use, helping technicians fine-tune barrel alignment, muzzle device indexing, and overall tolerances without sacrificing structural integrity. Ideal for experienced gunsmiths and competent hobbyists, the set supports meticulous shimming during barrel installation, torque planning, and leveling of critical components, ensuring consistent reliability across a variety of AR-15 builds. With its robust unfinished steel construction, the shim hardware resists wear and maintains dimensional accuracy under heat and friction, making it a practical choice for precision rifle assembly and maintenance. Incorporating this shim set into your rifle parts lineup enhances your ability to achieve optimal chamber alignment and bore tracking, resulting in improved accuracy, repeatability, and smooth cycling in .223 caliber AR-15 configurations.