Take Up Spring 2.5in ID 4in Tall 25lbs

The HYPERCO Take Up Spring 2.5in ID 4in Tall 25lbs (Model CS100) is a precision-engineered compression spring designed for law enforcement, military, and tactical firearms applications where reliable trigger reset and hammer or bolt carrier acceleration are mission-critical. Built to exacting standards, this spring serves as a replacement or upgrade component in semi-automatic and fully-automatic platforms that demand consistent performance under stress.

Manufactured by HYPERCO, a recognized leader in spring technology for motorsports and firearms applications, this take-up spring features a 2.5-inch inner diameter and stands 4 inches tall with a 25-pound spring constant—specifications that deliver predictable pre-load and consistent load rates critical for trigger group timing and bolt cycling dynamics. The compact weight of 0.51 pounds minimizes momentum changes while maintaining structural integrity under repeated compression cycles.

Armorers, gunsmiths, and individual operators upgrading trigger assemblies or bolt carrier groups will find this spring essential for restoring factory specifications. HYPERCO's quality control ensures dimensional consistency and material fatigue resistance, meaning you get uniform performance across thousands of rounds without degradation or loss of tension.