Eyeballing a railed, free-float handguard for perfect alignment with your flattop receiver is only half the battle. Keeping it from going cockeyed as you tighten the locking ring is another story. Talk about frustrating! Avoid the hassle with this handy jig that aligns the top handguard rail with the receiver rail and keeps it there. Just slide the jig on the rails, secure its setscrews, and tighten the locking ring�you�re done! With the time it saves, this tool will pay for itself the first few times you use it. A must for maintaining handguard alignment to ensure night vision devices, vertical grips, flip-up front sights, and other add-on accessories are also properly aligned. Precision machined from high-quality 6061 billet aluminum, then hardcoat anodized for extra strength and years of wear resistance. Designed for use with railed, free-float tubes that have a locking ring.