Fostech Echo AR-II Trigger

Product Description

The Fostech Echo AR-II Trigger is a drop-in binary trigger system for AR-15 and AR-10 platform rifles. It fires one round when the trigger is pulled and one round when the trigger is released, doubling your rate of fire without converting your rifle to full-auto. The AR-II model is purpose-built for shooters who want faster split times without the tax stamp.

Echo mode is selector-switchable. You can run safe, semi-auto, or binary depending on the range session or drill. The system fits mil-spec lower receivers and installs like a standard trigger group.

Binary triggers are legal under federal law because they fire only one round per function—once on pull, once on release. Your state and local laws may vary, so confirm legality in your jurisdiction before ordering.

Key Facts

• Product Name: Fostech Echo AR-II Trigger
• SKU: FT-ECHO-AR-II
• Brand: Fostech
• Platform Compatibility: AR-15 and AR-10 rifles with mil-spec lower receivers

How the Echo Trigger Works

The Fostech Echo AR-II operates in three modes: safe, semi-automatic, and echo (binary). In echo mode, the trigger releases the hammer on both the pull and the release. This is not a bump stock or a simulation—it is a true binary trigger mechanism.

Because each trigger function fires one round, the AR-II remains a Title I firearm component. No Form 4, no tax stamp, no NFA wait. It is a drop-in upgrade for shooters who want higher cadence without crossing into NFA territory.

The selector lets you switch modes on the fly. Run semi-auto for precision strings, flip to echo for speed drills or suppressive volume. The system does not alter your bolt carrier group, barrel, or gas system.

What to Know Before You Buy an Echo 2 Trigger

The Fostech Echo AR-II fits mil-spec AR lower receivers. If your lower uses a proprietary fire control pocket or a non-standard safety selector, call 817-393-4000 to confirm compatibility before ordering.

Binary triggers have a learning curve. Your first magazine in echo mode will feel different because you control the second shot with trigger release speed, not pull weight. Most shooters adapt within fifty rounds. Start slow and let muscle memory build.

Some states and municipalities restrict binary triggers even though they are federally legal. Texas does not prohibit them, but if you plan to travel with your rifle or move out of state, verify local laws first.

Fostech Echo Trigger vs. Standard AR Triggers

A standard semi-auto trigger fires once per pull. The Fostech Echo fires once per pull and once per release, effectively doubling your mechanical rate of fire without modifying gas flow or bolt velocity.

This is not a lighter pull weight or a shorter reset—it is a different firing sequence. The Echo AR-II does not make you more accurate; it makes you faster. Pair it with good fundamentals and it shines in competitive shooting, dynamic drills, and high-volume range sessions.

If you are building or upgrading an AR and want maximum flexibility, Western Sport stocks a full range of triggers and trigger parts including single-stage, two-stage, and binary options.

Buying from Western Sport in Roanoke, TX

Western Sport is a licensed FFL/SOT dealer and gunsmith shop serving North Texas and the DFW area since 2007. Owner and gunsmith Lance Rankin and his team handle transfers, special orders, and full gunsmithing services on site. Call 817-393-4000 to place an order, confirm fitment, or ask about installation.

Frequently Asked Questions

Q: Is the Fostech Echo AR-II Trigger legal?

A: The Fostech Echo AR-II is legal under federal law because it fires one round per trigger function—once on pull and once on release—without converting your rifle to full-auto. Texas state law does not prohibit binary triggers. Some other states and local jurisdictions do restrict them, so confirm your local laws before ordering.

Q: What AR platforms does the Echo AR-II trigger fit?

A: The Fostech Echo AR-II fits AR-15 and AR-10 rifles with mil-spec lower receivers. If your lower uses a proprietary fire control pocket, non-standard pins, or an integrated trigger group, call 817-393-4000 to verify compatibility before you order.

Q: How does echo mode differ from semi-auto mode?

A: In semi-auto mode, the trigger fires one round per pull. In echo mode, the trigger fires one round on the pull and one round on the release. You control the second shot by releasing the trigger, which doubles your cyclic rate without modifying the rifle’s gas system or bolt.

Q: Can I switch between semi-auto and echo mode?

A: Yes. The Fostech Echo AR-II has a selector that lets you choose safe, semi-auto, or echo (binary) mode. You can change modes during a range session or match without tools.

Q: Do I need any ATF paperwork to buy the Echo trigger?

A: No. The Fostech Echo AR-II is a Title I firearm component and does not require an ATF Form 4, tax stamp, or NFA transfer. It ships like any other trigger group or lower part.

Q: Will Western Sport install the Fostech Echo trigger if I order one?

A: Western Sport offers full gunsmithing services on site. If you need installation, fitting, or function testing, call 817-393-4000 to schedule service with Lance Rankin and the gunsmith team in Roanoke.

Additional information