In Lead We Trust Recoil Springs for Sig Sauer MPX Gen II Factory Rate
Product Description
The In Lead We Trust (ILWT) Recoil Springs for the Sig Sauer MPX (Gen II Factory Rate) are high-grade replacement springs engineered specifically to match the original factory spring tension and load characteristics of Gen 2 Sig MPX carbines and pistols. Designed to restore precise bolt carrier timing, eliminate sluggish battery lockup, and ensure 100% feeding reliability, this calibrated pair of springs is an essential maintenance upgrade for shooters seeking true OEM-specification cycling dynamics.
Precision-wound from premium heat-treated spring steel, these ILWT recoil springs offer exceptional tensile durability, resistance to permanent length compression, and consistent energy storage across extended firing schedules. Factory MPX recoil springs experience extreme stress from rapid gas piston impulses and bolt carrier travel, leading to spring set and degradation over time. Installing the Gen II Factory Rate springs restores proper bolt return velocity without increasing felt recoil or altering the rifle's balanced cycling impulse.
Supplied as a matched pair, the ILWT Gen II Factory Rate Recoil Springs drop directly onto standard factory dual guide rods or aftermarket ILWT custom guide rod assemblies. Whether replacing tired factory springs during routine armorer maintenance or setting up a reliable spare parts kit, these springs provide consistent, lock-solid performance across standard 9mm commercial and military-grade ammunition.
Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Direct replacement for Gen 2 Sig Sauer MPX dual guide rod recoil springs (also compatible with Gen 1 models when updating to Gen 2 guide rod setups and ILWT custom MPX barrels).
- Perform a complete firearm safety check: drop the magazine, lock the bolt rearward, and visually inspect the chamber to confirm zero live ammunition is present.
- Push out the rear takedown pin and pivot the upper receiver open, then compress and remove the dual guide rod and bolt carrier assembly from the upper receiver.
- Carefully remove the rear retaining clips or collars from the dual guide rods while keeping spring tension controlled (always wear safety glasses).
- Slide off the worn factory recoil springs, thoroughly wipe down the guide rods, and inspect for scoring or carbon buildup.
- Apply a thin coat of high-grade weapons oil to the guide rods, slide on the new ILWT Gen II Factory Rate springs, compress, and reinstall the retaining hardware.
- Reinsert the carrier group into the upper receiver, reassemble the platform, and perform a manual rack and function test to confirm smooth forward battery movement.
Key Features
- Calibrated Gen II Factory Rate Tension: Engineered to match exact OEM factory spring rates for smooth, balanced bolt carrier velocity and lockup.
- High-Tensile Heat-Treated Spring Steel: Resists set compression, thermal degradation, and structural fatigue over thousands of rounds.
- Restores Factory Reliability: Eliminates failure-to-feed issues and sluggish battery closure caused by worn, compressed stock springs.
- Matched Dual Spring Pair: Includes two calibrated springs specifically matched for the Sig MPX twin guide rod architecture.
- Versatile Ammo Compatibility: Optimized for standard 115gr, 124gr, and 147gr 9mm ammunition under factory gas settings.
- Direct Drop-In Fitment: Installs directly onto factory Sig MPX guide rods without requiring custom fitting or permanent modification.
Product Specifications
- Brand: In Lead We Trust (ILWT)
- Model/Series: MPX Recoil Springs (Gen II Factory Rate)
- MPN / SKU: ILWT-MPX-RSP-GEN2
- Platform Fitment: Sig Sauer MPX (Gen II / Gen 2) & ILWT MPX Guide Rods
- Spring Rate: Factory Standard Gen 2 Equivalent
- Quantity: Pair (2 Springs Included)
- Material: Heat-Treated High-Tensile Spring Steel
- Finish: Natural / Micro-Coated
- Country of Origin: USA
