Geissele SD-C Super Dynamic Combat Trigger Group - Two Stage Matte for AR-15, LR-308

The Geissele SD-C Super Dynamic Combat Trigger Group is a two-stage AR-15 and LR-308 trigger built for shooters who demand a sharp, predictable break without the complexity of adjustability. Based on Geissele's proven Super Semi-Automatic platform, the SD-C trades the curved trigger bow of its sibling for a flat profile—a preference among tactical shooters and competition runners who want consistent finger placement and faster follow-ups. Non-adjustable and purpose-built for combat-style shooting, this trigger pairs a wide safety margin against accidental discharge with the crisp release that makes Geissele triggers a go-to upgrade for serious riflemen.

The two-stage design means you get tactile and audible feedback as you press through the first stage (2.75–3.0 lbs.), then a clean, predictable break on the second stage (1.5–1.75 lbs.). Total pull weight runs 4.25–4.75 lbs., giving you control without mushy takeup. The flat trigger bow sits lower and closer to the mag well than traditional curved bows, which many shooters prefer for faster transitions and a more natural grip angle—especially in tactical drills or high-round-count range days.

This is a mil-spec AR-15 and LR-308 trigger; it will not work in Sig MPX/MCX platforms or AR-15 pistol-caliber carbine variants. If you're running a standard AR platform and want a combat-proven trigger that requires no tuning out of the box, the Geissele SD-C delivers the repeatability and safety margin you expect from a professional-grade fire control group.

Key Features

• Two-stage trigger with crisp, repeatable break—no adjustments needed
• Flat trigger bow for faster target transitions and ergonomic control
• Mil-spec pin compatibility for standard AR-15 and LR-308 platforms
• Wide safety margin against unintentional discharge
• Matte finish for durability and reduced glint

Specifications

Frequently Asked Questions

Will this Geissele SD-C trigger fit my AR-15 or LR-308?

Yes—the SD-C is designed for mil-spec AR-15 and LR-308 platforms with standard trigger pin dimensions. It will not work in Sig MPX, Sig MCX, or AR-15 pistol-caliber carbine variants.

Is the SD-C trigger adjustable?

No. The SD-C is a non-adjustable trigger. The pull weights and stage breaks are fixed and tuned out of the box—no tools or tuning required.

What's the difference between a flat trigger bow and a curved one?

A flat trigger bow sits lower and closer to the magazine well, offering more consistent finger placement and faster transitions between targets. The SD-C's flat profile is preferred by shooters running tactical drills or high-speed range work.

What pull weight can I expect from the SD-C?

Total pull weight ranges from 4.25–4.75 lbs. The first stage breaks at 2.75–3.0 lbs., followed by a clean second-stage break at 1.5–1.75 lbs.