Nighthawk custom's FM series barrel links set a new benchmark in precision engineering for 1911 enthusiasts. Crafted from premium-grade 416 stainless steel, these Fully Machined links are designed to deliver unmatched accuracy and performance. Essential for achieving the precise vertical lockup necessary for optimal accuracy, these links are a must-have for any serious shooter looking to enhance their 1911. The FM series link kit includes five distinct sizes, providing the versatility needed to fine-tune your Nighthawk custom Match Grade barrel for superior precision. Nighthawk custom's commitment to quality is evident in every Fully Machined part, which is CNC machined from solid steel billets. This meticulous process ensures exceptional strength and exacting tolerances, setting the gold standard in the 1911 parts industry. Unlike other manufacturers, Nighthawk custom never uses cast, metal injected moldings or polymer parts, guaranteeing that only the finest materials are used in crafting the World's Finest 1911s. With a lifetime warranty backing every Fully Machined part, you can trust Nighthawk custom to provide the best components for your build, ensuring lasting confidence in your 1911's performance. Whether upgrading barrels, bushings or barrel links, choose Nighthawk custom's FM series for unparalleled precision and reliability. The center-to-center hole distance is specified as 0.010 inches oversize to 0.010 inches undersize