The CMMG AR-15 Trigger Guard Assembly (Part #55CA57E, UPC 810046231302) is a mil-spec style upgrade and replacement part designed to add durability, clean looks, and hassle-free installation to any AR-15 lower receiver. Built from sturdy, lightweight aluminum with a sleek black finish, this trigger guard assembly is perfect for builders, armorers, and shooters who want a reliable, no-nonsense part that just works.
Mil-Spec Style Trigger Guard for AR-15 Lowers
This CMMG trigger guard assembly is made specifically for AR-15 pattern rifles, following a mil-spec style profile that fits most standard lowers.
Compatible with AR-15 rifles and carbines using mil-spec dimensions
Ideal as a replacement for worn or damaged factory trigger guards
Great for new builds where you want a trusted, name-brand part instead of a generic no-name piece
Because it sticks close to mil-spec dimensions, you can count on consistent fitment with a wide range of forged AR-15 lower receivers.
Durable, Lightweight Aluminum Construction
One of the standout features of the CMMG AR-15 Trigger Guard Assembly is its aluminum construction.
Built from robust yet lightweight aluminum, it adds virtually no noticeable weight to your rifle
More resistant to cracking and breakage than cheap plastic trigger guards
Designed to handle the bumps, drops, and hard use that AR-15s often see at the range, in classes, or in the field
The sleek black finish helps protect the metal from wear and corrosion while matching most black anodized lowers and accessories for a clean, uniform look.
Easy, Hassle-Free Installation – Spring-Loaded Front Pin
CMMG designed this trigger guard with user-friendly installation in mind.
Features a spring-loaded front pin, meaning the front of the guard snaps into place without the usual frustration of hammering in a roll pin.
You only need to install a single rear roll pin to lock it down—simple and much less risky for your lower receiver’s ears.
This is especially helpful if you’re building at home and want to minimize the chance of cracking or marring the lower near the trigger guard area—something that can happen when driving traditional roll pins without proper support.
Clean, Functional Design for Everyday Use
The CMMG AR-15 Trigger Guard Assembly sticks to a classic, functional shape that:
Provides ample room for normal trigger use with bare hands or light gloves
Maintains a low-profile, snag-free profile that works well with standard grips and lower parts kits
Preserves the clean, streamlined look of a professional AR build
While it isn’t an oversized “winter” trigger guard, it’s a dependable, all-purpose option that keeps your rifle looking and functioning like a well-built mil-spec carbine.
Perfect for Builders, Upgrades, and Spare Parts Kits
Because it’s affordable, compact, and easy to install, this CMMG part makes sense in several roles:
New AR-15 builds – finish your lower with a high-quality, branded trigger guard instead of a bargain-bin unknown.
Upgrades – swap out cheap polymer guards for a more durable aluminum component.
Spare parts kits – keep one on hand for emergencies, lower rebuilds, or future projects.
If you assemble multiple rifles or help friends with builds, having a few of these trigger guards nearby is simply smart planning.
Key Specs – CMMG AR-15 Trigger Guard Assembly 55CA57E
Manufacturer: CMMG, Inc.
Product Name: AR-15 Trigger Guard Assembly
Manufacturer Part Number (MPN): 55CA57E
UPC: 810046231302
Platform Compatibility: AR-15 rifles and carbines (mil-spec style)
Material: Lightweight aluminum
Finish: Black, wear- and corrosion-resistant
Design: Mil-spec style trigger guard assembly with front spring-loaded pin and rear roll-pin retention
Weight: Approx. 0.10 lb (shipping weight)
If you’re looking for a reliable, mil-spec style AR-15 trigger guard that’s durable, easy to install, and matches your rifle’s black finish, the CMMG AR-15 Trigger Guard Assembly 55CA57E (UPC 810046231302) is a smart, budget-friendly choice for new builds, upgrades, and spare-parts kits alike.
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