*CONTACT US FOR A SPECIAL COUPON CODE!*
CMMG Factory AR-15 Mil-Spec Single-Stage FCG Component Trigger Kit - 55AFF97
Product Description
Assembling a custom modern sporting rifle from a stripped lower receiver or re-establishing a combat-ready baseline on a weathered duty weapon often encounters an immediate mechanical bottleneck: component inconsistency. Generic, unbranded lower components or poorly forged replacement groups frequently bring out out-of-spec pin dimensions, rough engagement surfaces, and uneven spring rates. These factors introduce a gritty, unpredictable take-up creep and inconsistent sear alignment that can lead to subtle muzzle movement at the point of ignition. The CMMG Factory AR-15 Mil-Spec Trigger Kit completely eliminates these variables, delivering a highly precise fire control group (FCCG) engineered to traditional USGI blueprints to serve as an unyielding core for any serious service tool.
Precision-ground from high-tensile structural investment steel castings, the CMMG 55AFF97 kit undergoes meticulous computer-controlled tempering and case-hardening cycles. This multi-material treatment optimizes internal grain structure alignment, producing a durable, wear-resistant outer profile that absorbs heavy cyclical shockwaves without risk of fractures or deformation. The entire assembly is encapsulated in a protective, non-reflective black oxide conversion jacket to repel carbon slurry, lock in lubricants, and defend against harsh copper solvents. Modeled directly after the classic M16 field framework and modified exclusively for semi-automatic weapon tracking, every engagement path is precisely squared to ensure optimal parallel tracking alignment within any mil-spec lower receiver.
In high-volume live-fire training or remote survival loadouts, this single-stage trigger platform represents an absolute benchmark of drop-safe mechanical security. It features a traditional curved trigger bow profile that guides the operator's finger pad into a consistent central indexing seat, enabling a smooth rolling trigger pull. The kit arrives factory-timed and includes full-power, heavy-duty mil-spec springs that hold a steady 5.5 to 8.5-pound break profile, ensuring complete compliance with duty protocols while guaranteeing positive ignition across stubborn, hard-primed military surplus ammunition. Packaged fully furnished down to the centerless ground hammer and trigger pins, this American-made kit keeps your fire control tracking smooth and continuous.
*Armorer Bench Notes & Technical Maintenance Guidance: The CMMG Mil-Spec Trigger Kit (55AFF97) drops natively into standard small-pin (.154/.156 inch) AR-15 lower receivers, as well as large-frame AR-10, LR-308, and SR-25 pattern receiver platforms. When conducting your bench installation, verify that the small disconnector spring is oriented with its slightly wider, flared base seated down inside the rear trigger cavity pocket before sliding the disconnector over the trigger channel. When dropping in the hammer assembly, the two long legs of the heavy hammer spring must point rearward and rest flat across the top outer shoulders of the trigger pin, as this interface acts as a physical anchor to prevent the pin from walking out of the receiver walls during rapid-fire strings. Apply a tiny micro-dot of premium high-viscosity synthetic grease directly onto the primary sear engagement hook to clean up moving friction and smooth out the reset path. Always verify your build with a manual function test before pinning the upper; catching the hammer with your thumb rather than letting it slap dry into an empty lower prevents micro-fracturing along the receiver's bolt-catch ears.
Key Features
- Authentic M16 Blueprints: Built strictly to military technical specification standards and modified for semi-automatic configurations, ensuring standard structural layout.
- Full-Power Primer Detonation: Outfitted with heavy-duty mil-spec springs engineered to strike with maximum authority, safely clearing hard military surplus primers.
- Precision Ground Castings: Machined from high-tensile investment steel castings rather than soft, cheap metals to guarantee indefinite performance life under rapid-fire cycles.
- Black Oxide Protective Shield: Wrapped in a matte black oxide conversion layer that locks out environmental moisture, resists carbon scale, and helps retain lubrication.
- Complete 8-Piece FCG Core: Packages every single critical spring, pin, and disconnector required to fully complete a bare trigger well out of a single box.
Product Specifications
- Brand: CMMG (Central Missouri Machine Guns)
- Model Line: High-Performance Factory Small Parts Group
- MPN/SKU: 55AFF97
- UPC: 815835018256
- Platform Fitment: Standard AR-15 and AR-10 / LR-308 Small-Pin Receivers
- Trigger Type Configuration: Single-Stage Mil-Spec
- Trigger Bow Profile: Traditional Curved Bow
- Pull Weight Target Range: 5.5 lbs - 8.5 lbs (Standard Mil-Spec Weight Threshold)
- Pin Size Configuration: Standard Small Pin (.154" / .156" Diameter)
- Material Base: Tempered Case-Hardened Investment Cast Steel
- Finish Treatment: Non-Reflective Black Oxide Conversion Finish
- Kit Contents Matrix: 1x Hammer, 1x Trigger, 1x Disconnector, 1x Hammer Spring, 1x Trigger Spring, 1x Disconnector Spring, 2x Hammer/Trigger Receiver Pins
- Country of Manufacture: United States
