One Platform. Four Configurations. Choose the FRS That Fits Your Build.

The Atrius Forced Reset Selector (FRS) is a precision-machined three-position selector system designed for compatible AR-15 fire control groups.

Built from heat-treated 4140 steel and protected by a corrosion-resistant black nitride finish, the Atrius FRS combines durable construction with positive selector engagement and multiple configurations for different builds and trigger setups.

Choose from Standard, Mil-Spec, Ambidextrous, or G-Lever Ambidextrous configurations.

Key Features

• Three-position SAFE | SEMI | SUPER-SEMI configuration
• Heat-treated 4140 steel construction
• Corrosion-resistant black nitride finish
• Positive 90-degree selector indexing
• Designed for compatible AR-15 fire control groups
• Multiple selector configurations available
• Standard and ambidextrous options
• Specialized G-Lever option for select Geissele triggers
• Made in the USA

Choose Your Configuration

Standard FRS – Single-Sided

The original Atrius FRS configuration.

This version features Atrius’ purpose-built, textured selector lever and a single-sided control. It is a straightforward choice for customers using compatible mil-spec or full-profile AR-15 fire control groups who do not need an ambidextrous selector.

Best for:

• Standard AR-15 configurations
• Right-handed shooters
• Customers who prefer Atrius’ ergonomic selector design

Selector: Single-sided
Style: Atrius ergonomic lever
Trigger Compatibility: Compatible mil-spec/full-profile and select cassette-style fire control groups

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Mil-Spec FRS – Single-Sided

The Mil-Spec Atrius FRS provides the same core FRS system with a more traditional selector appearance.

Its familiar mil-spec-style lever makes it especially well suited for rifles where a traditional or retro appearance is preferred.

Best for:

• Retro-inspired builds
• Traditional AR-15 styling
• Customers who prefer a familiar mil-spec selector profile

Selector: Single-sided
Style: Traditional mil-spec-style lever
Trigger Compatibility: Compatible mil-spec/full-profile and select cassette-style fire control groups

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Ambidextrous FRS

The Ambidextrous Atrius FRS adds selector controls on both sides of the receiver, making the system easier to manipulate from either side.

It is an excellent choice for left-handed shooters or anyone who prefers fully ambidextrous controls.

Best for:

• Left-handed shooters
• Ambidextrous builds
• Shooters who want selector access from either side

Selector: Ambidextrous
Style: Atrius ergonomic levers
Trigger Compatibility: Compatible mil-spec/full-profile and select cassette-style fire control groups

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G-Lever Ambidextrous FRS

The G-Lever is the most specialized version of the Atrius FRS lineup.

In addition to an ambidextrous selector configuration, the G-Lever expands compatibility to select Geissele trigger systems and other compatible reduced-hammer-profile designs.

Atrius specifically lists compatibility with:

• Geissele SSA
• Geissele SSA-E
• Geissele G2S

Geissele X-Series triggers are not currently listed as compatible.

Best for:

• Geissele SSA-equipped builds
• Geissele SSA-E-equipped builds
• Geissele G2S-equipped builds
• Builds requiring the G-Lever’s expanded trigger compatibility
• Ambidextrous configurations

Selector: Ambidextrous
Style: Atrius ergonomic levers with G-Lever system
Trigger Compatibility: Compatible standard fire control groups plus select Geissele triggers

Configuration Comparison

Version	Single-Sided	Ambidextrous	Mil-Spec Style	Expanded Geissele Compatibility
Standard FRS	Yes	No	No	No
Mil-Spec FRS	Yes	No	Yes	No
Ambidextrous FRS	No	Yes	No	No
G-Lever Ambidextrous FRS	No	Yes	No	Yes

Compatibility

Standard Atrius FRS configurations are designed around compatible mil-spec and full-profile AR-15 fire control groups.

Atrius states that its FRS products have direct compatibility with mil-spec triggers that do not have a U-shaped relief cut and that compatibility also extends to a variety of single-stage cassette-style triggers.

Because aftermarket trigger, hammer, receiver, and fire control group dimensions can vary, verify compatibility with your specific setup before ordering.

Customers using compatible Geissele SSA, SSA-E, or G2S triggers should select the G-Lever configuration.

Specifications

Manufacturer: Atrius Development Group
Platform: Compatible AR-15
Material: Heat-Treated 4140 Steel
Finish: Black Nitride
Selector Positions: SAFE | SEMI | SUPER-SEMI
Selector Movement: 90° indexing
Configurations: Standard, Mil-Spec, Ambidextrous, G-Lever Ambidextrous
Country of Manufacture: USA

Which Version Should I Buy?

Want the standard Atrius setup?
Choose Standard FRS.

Want a traditional AR-style selector?
Choose Mil-Spec FRS.

Want controls on both sides?
Choose Ambidextrous FRS.

Running a Geissele SSA, SSA-E, or G2S?
Choose G-Lever Ambidextrous FRS.

Important Compatibility & Legal Notice

Firearm components and receiver tolerances can vary. Compatibility should be confirmed before installation or modification.

This product is intended only for lawful use. The purchaser is responsible for determining whether possession, purchase, installation, and use of this product are lawful under all applicable federal, state, and local laws.

Not available for sale or shipment where prohibited by law.

Firearm-related components that have been installed, fitted, modified, damaged, or fired may not be eligible for return under the FTA Tactical Return Policy.

Select Your Configuration Above

Standard. Mil-Spec. Ambidextrous. G-Lever.

Choose the Atrius FRS configuration that matches your build.