Glock, G21 Gen4 Recoil Spring Assembly, .45 Auto

The Glock OEM RCL SPRNG ASM G21 Gen4 is the recoil spring assembly that brings factory reliability and quality construction back to your Glock .45 Auto pistol, and if you own a G21 Gen4 this is the direct-fit part designed to maintain the slide timing and felt recoil you expect from Glock pistols. Built to OEM tolerances, the assembly delivers consistent performance shot after shot, which matters whether you're putting rounds downrange for training, carrying for duty use, or preparing a hunting handgun for heavy use in the field. Swapping in this factory recoil spring is a straightforward maintenance task for range crews and home armorers alike, restoring proper cycling with standard and suppressed setups and helping older guns meet original recoil and lockup characteristics. As an OEM part from Glock, it's made to the same standards as the pistol line, so you get predictable spring rate, corrosion-resistant finish, and long service life—key attributes for anyone who values reliability, spare-parts compatibility, and smooth handgun operation.