The Lone Wolf guide rod assembly is designed for experienced shooters who recognize the shortcomings of plastic guide rods. Unlike plastic versions that may chip, crack or break, leading to feeding or ejection issues, this guide rod assembly is built for durability and precision. Its sturdy construction removes the flex often found in plastic rods, improving accuracy and reliability. Engineered for long-lasting performance, the Lone Wolf guide rod assembly ensures smooth and consistent firearm operation, offering peace of mind and an enhanced shooting experience. Complete drop-in unit for generation 1-3 Glock firearms Single-piece stainless steel guide rod The component is precisely CNC machined to accommodate a removable 3/32 inches Allen head tip The models 17 and 22 are equipped with Lone Wolf distributors' proprietary 17 lb flat-wound recoil spring The integration of these features establishes the Lone Wolf guide rod assembly as the most durable and long-lasting system currently available It is recommended to replace the springs every 3,000 rounds for calibers .40 Cal, 10mm and .357 Cal and every 5,000 rounds for calibers 9mm and .45 Cal If the spring slips over the endcap screw, reverse the spring and reinstall it Most springs have a slightly tapered end, which should be positioned on the endcap side