Fostech Echo AR II Drop In Binary AR-15 Trigger

The Fostech Echo AR II Drop In Binary AR-15 Trigger transforms your AR-15’s firing capability by enabling binary operation—one shot on pull, another on release—without compromising reliability or precision.

What you get

• Binary firing mode: fires one round on trigger pull and another on release
• Drop-in design for straightforward installation
• Adjustable pull weight ranging from 4.5 to 5.5 pounds
• Compatible with most AR-15 platforms
• Includes anti-walk pins for secure mounting
• Made in the U.S.A.

Build and finish

The Fostech Echo AR II is crafted with precision-machined components, ensuring tight tolerances and consistent performance. The trigger housing is constructed from durable aluminum, treated with a corrosion-resistant finish to withstand harsh environments and high round counts. Internal springs and sears are heat-treated for longevity, while the trigger shoe features a smooth, polished surface for comfortable operation.

Designed for reliability, the Echo AR II’s binary mechanism operates flawlessly under rapid fire conditions. The trigger’s internals are engineered to minimize friction and wear, maintaining a crisp break and reset cycle even after extended use. This attention to detail makes it a dependable choice for competitive shooting, tactical applications, or recreational use.

Compatible platforms

• AR-15 rifles
• AR-10 rifles (with minor modification)
• Most AR-style platforms with Mil-Spec trigger groups

Installation notes

Installation is straightforward thanks to the drop-in design. Simply remove your existing trigger group, insert the Echo AR II, and secure it with the included anti-walk pins. No specialized tools or gunsmithing skills are required, though a basic understanding of AR-15 disassembly is recommended.

For AR-15 enthusiasts looking to enhance their rifle’s performance, the Fostech Echo AR II Drop In Binary Trigger offers a practical upgrade. Whether you’re competing, training, or exploring new shooting dynamics, this trigger delivers consistent results without sacrificing reliability. Pair it with our selection of AR-15 accessories to complete your setup.