Geissele Super MCX SSA, M4 Curve Trigger Bow 05-658

The Geissele Super MCX SSA, M4 Curve Trigger Bow 05-658 isn't a standard AR trigger dropped into a different housing. It's built specifically for the SIG MCX platform, with a reinforced hammer and disconnector designed around the MCX's piston-driven recoil dynamics, something a generic AR-15 trigger was never engineered to handle long-term.

Underneath that platform-specific engineering is the same DNA as Geissele's CRANE Safety Certified M4 carbine trigger, the Super Semi-Automatic (SSA). This Geissele MCX trigger carries over the same reliability, safety, and forgiveness the SSA is known for, just packaged for a completely different bolt carrier system. First stage weight runs 2.75-3 lbs, second stage comes in at 1.5-1.75 lbs, for a total pull weight around 4.5 lbs, heavier than Geissele's precision-focused triggers by design, giving more margin under stress during CQB-style manipulation.

That balance is really the point of this trigger. Light enough that precision shooting doesn't feel like fighting the gun, forgiving enough that fast, high-pressure work doesn't turn into an accidental break. Non-adjustable, with an M4 curved bow and standard 0.154" small-pin compatibility, it drops directly into current MCX trigger housings without any fitting or gunsmithing.

Whether it's hunting, law enforcement, or military-style use, this MCX trigger is built to be the one trigger that works across all of it, not a specialist tool that excels in one narrow application and struggles everywhere else.

Key Features

• Purpose-built specifically for the SIG MCX platform
• Reinforced hammer and disconnector for MCX recoil dynamics
• First stage weight of 2.75-3 lbs
• Second stage weight of 1.5-1.75 lbs
• Total pull weight of approximately 4.5 lbs
• Non-adjustable, M4 curved trigger bow
• Standard 0.154" small-pin drop-in compatibility
• Suited for hunting, law enforcement, and military use