ISMI Recoil Springs for Glock Full Size Models

Designed to fit Guide Rods for Glock Gen 1-4 Models: G17, G17L, G20, G21, G22, G24, G31, G34, G35, G37.

Does Not Fit: Heavyweight Guide Rods, Compact Models.

Upgrade or fine-tune your full-size Glock pistol with ISMI Recoil Springs, available from NDZ Performance. Engineered specifically for full-size Glock Gen 1-4 slide assemblies, these competition-grade recoil springs deliver consistent slide velocity, dependable cycling, and long-term durability across a wide range of firearm configurations and ammunition loads. Manufactured from premium chrome-silicon wire, each ISMI recoil spring is precision wound and processed to maintain stable force and geometry through repeated firing cycles. This helps promote reliable feeding, extraction, ejection, and slide return while reducing the inconsistent performance associated with worn factory springs. Choose from 11 lb., 13 lb., 15 lb., 17 lb., 20 lb., 22 lb., or 24 lb. spring weights to match your pistol, ammunition, compensator, or competition setup. Lighter springs can help optimize cycling with reduced-power loads, while heavier springs may better control slide velocity with hotter ammunition or specialized builds. For shooters who need greater flexibility, the ISMI Tuner Pack includes one of every available spring weight. This allows you to test multiple configurations and identify the spring that delivers the best balance of cycling reliability, recoil control, and return-to-battery performance for your setup.

Features:

• Designed specifically for full-size Glock slide assemblies and available in: 11 lb., 13 lb., 15 lb., 17 lb., 20 lb., 22 lb., and 24 lb. spring weights.
• Tuner Pack includes one of each available spring weight.
• Supports recoil tuning for factory pistols, competition builds, compensators, and custom ammunition.
• Precision wound from premium chrome-silicon wire.
• Maintains stable spring force and geometry through repeated firing cycles.
• Suitable for competition, range, defensive, and custom full-size Glock configurations.

See our complete line of Glock Gen 1-4 Products here

Note: NDZ always recommends any part be installed by a qualified and trained gunsmith. NDZ promotes the use of safety practices and gear when working on any firearm.