CMMG Rifle Buffer Spring Action AR15 55CA93F

CMMG AR-15 Rifle Buffer / Action Spring — 55CA93F (UPC 815835013473) Keep your rifle cycling smoothly with the CMMG AR-15 Rifle Buffer Spring (Action Spring)—a precise, durable replacement engineered to restore consistent bolt carrier velocity, reliable lock-back, and clean feeding/ejection across a wide range of loads. Whether you’re refreshing a well-used setup or completing a new fixed-stock rifle build, this CMMG spring (Model 55CA93F, UPC 815835013473) delivers dependable, mil-spec–style performance you can feel every time you press the trigger. Why Choose the CMMG Rifle Action Spring Mil-spec–style geometry for predictable, repeatable cycling and proper carrier return. Quality spring steel for longevity, resilience, and resistance to set/creep over high round counts. Consistent wire temper & wind to reduce twang, harmonics, and inconsistent lock timing. True rifle-length format designed for A1/A2 fixed-stock receiver extensions (rifle tubes). Drop-in replacement for straightforward maintenance and reliability upgrades. CMMG quality assurance trusted by armorers, competitors, and serious enthusiasts. Designed for Smooth, Reliable Cycling A healthy action spring is critical to AR-15 reliability. The CMMG Rifle Buffer Spring provides the correct return force to drive the carrier forward with authority, chamber the next round, and produce consistent bolt catch lock-back on empty. Optimized spring rate and length help reduce short stroking, sluggish return, and erratic ejection that can emerge as springs wear. Ideal Applications Fixed-stock rifle builds (A1/A2) using rifle-length receiver extensions and rifle buffers Refresh/maintenance on legacy service rifles and precision SPRs Duty/training carbines with fixed stocks where reliability and service life matter Competition & varmint rigs seeking consistent cycling across temperature and ammo variations Compatibility Note: This is a rifle-length action spring for rifle receiver extensions (fixed stocks). It is not a carbine spring and is not intended for carbine-length receiver extensions. Always match spring, buffer, and receiver extension lengths (rifle with rifle, carbine with carbine). Installation & Maintenance (General Guidance) Unload and clear the firearm before servicing. Remove the stock/receiver extension components per your armorer’s manual. Inspect the buffer, spring, and receiver extension for fouling or burrs; clean as needed. Insert the CMMG rifle action spring and rifle buffer into the rifle-length tube, ensuring free movement. Function check: cycle the action by hand and verify smooth, unobstructed travel and positive lock-back. Always follow manufacturer torque values and safety practices. If you’re uncertain, consult a qualified armorer. Signs It’s Time to Replace Your Spring Weak lock-back or intermittent failure on last round Erratic ejection patterns or sluggish return stroke Excessive “twang” or noticeable length loss versus a new spring High round count service interval coming due Technical Details Product: CMMG AR-15 Rifle Buffer / Action Spring Model / SKU: 55CA93F UPC: 815835013473 Type: Rifle-length action spring (AR-15 pattern) Use With: Rifle-length receiver extension (A1/A2) + rifle buffer Material: Quality spring steel, mil-spec–style SEO Quick Facts (For Easy Scanning) CMMG AR-15 rifle action spring replacement Mil-spec–style rifle buffer spring for fixed stocks Model 55CA93F, UPC 815835013473 Compatible with AR-15 A1/A2 rifle receiver extensions Restores cycling reliability and consistent lock-back The Bottom Line If your AR-15 is due for a refresh—or you’re finalizing a fixed-stock rifle build—the CMMG Rifle Buffer / Action Spring (55CA93F) is a smart, dependable choice. It’s built to the spec and consistency that keep your rifle running cleanly, with the service life and stability you expect from CMMG. The End