The CMMG Spring Action Mk3 (CMMG part no. 38CA9EB) is an action spring component built for CMMG’s Mk3 AR-platform rifle line. As a small parts group component, it’s intended for shooters servicing or rebuilding the internals of a CMMG Mk3-pattern rifle or upper. Weighing in at roughly 0.175 pounds, it’s a lightweight, precision-made replacement spring rather than a generic aftermarket substitute. CMMG Mk3 owners doing routine maintenance or a parts-kit rebuild get a factory-matched spring instead of guessing at a universal part’s fit.

Key Specifications

• Built specifically for the CMMG Mk3 platform.
• Functions as an action spring component within the rifle’s internals.
• Weighs approximately 0.175 pounds.

Frequently Asked Questions

What platform is this spring built for? It’s built specifically for CMMG’s Mk3 AR-platform rifle line.

When would I need to replace this spring? Action springs are typically replaced during routine maintenance or a parts-kit rebuild if the original has weakened or worn out.

Buy the CMMG Spring Action Mk3

Order this CMMG spring from our Lubbock, Texas gun shop for fast, insured shipping, and browse the rest of our AR buffer system parts to complete your build.