(X-Series) Ambidextrous Forced Reset Selector

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This is the Atrius Ambidextrous X-SERIES Forced Reset Selector. The latest addition to the FRS family which features a new trip system that has a trip base and trip clutch to allow for a universal fitment amongst gas piston platforms.

-Platform Compatibility:
-MCX®, MCX-Spear LT®, MCX-Rattler LT®, MCX-Spear LT Upper AR Conversion Kit®, MPX PCC®, MPX-K®

-Compatible with all generations (safety latch may need to be removed in early gens)
-Trigger Compatibility:
- Mil-Spec Triggers that come with MCX/MPX platforms
- Single stage mil-spec triggers that do not have a u-notch or relief cut

ETA LEAD TIME: 3-4 WEEKS

$319.00

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Manufactured In USA

PRODUCT SPECIFICATIONS

The Atrius Development Group FRS X-Series was designed to be compatible with a variety of Sig Sauer MCX®, MPX®, Rattler® platforms, and even Sig's MCX-Spear LT Upper AR Conversion Kit.

Features

Style: Atrius Ambi Selector Switch (original design)
Configuration: Safe, Semi, Super-Semi
Includes a new FRS lever with dimension compatible for MCX/MPX product lines
Universal design for Sig Sauer® gas piston platforms
Installation: Drop-In Ready (No Modifications Necessary)
Manufactured in the USA

Materials

Corrosion Resistant Black Nitride Finish
Made of Heat Treated 4140 Steel

Drop-In Installation

Swap out your factory safety in minutes and experience the next level of firearm ownership.

Runs with Mil-Spec Fire Control Groups

Seamlessly integrates with standard AR fire control groups and some cassette style triggers.

Hardcore Durability

Crafted from heat-treated, 4140 steel and coated in a corrosion-resistant black nitride finish. Rain, mud, sweat—it eats it all for breakfast.

No Modifications Necessary

No cutting your triggers. Ensures flawless function and longevity without modification.

Aggressive Ergonomics

Textured, chamfered-edge, and purpose-built design for speed. Your fingers will find the selector instantly, even under stress.

Installation Steps for X-Series Ambidextrous Forced Reset Selector

1 Install X-Series FRS as you normally would any other safety selector.
2 Install your fire control group (trigger).
3 Insert trip base on left side of the receiver and marry to rear trigger pin.
4 Insert trip clutch onto the track of trip base and push all the way forward.
5 Press trip base down so it's under rear takedown pin.
6 Ensure the entire trip hasn't shifted during previous steps.
7 Install upper receiver and dry function check.

Atrius Forced Reset Selectors

Product Comparison

Product

Single Switch

Ambi Switch

Lever Blocker

For Gas Piston System

Notes

FRS Standard / Single

✓ Yes

—

Standard ergonomic switch for ease of use

FRS Mil-Spec / Single

✓ Yes

—

Has mil-spec style switch

FRS Ambi

—

✓ Yes

—

Great for left-handed users

FRS Ambi G-Lever

—

✓ Yes

—

Has additional Geissele trigger compatibility

FRS Ambi X-Series

—

✓ Yes

—

✓ Yes

Compatibility

All Atrius FRS products have direct compatibility with mil-spec triggers that do not have a relief cut (U-notch).
They also are compatible with a wide variety of single-stage, drop-in / cassette style triggers as well.
The “G-LEVER” is the only FRS product that carries expanded compatibility to work with select Geissele triggers and similar products that feature a reduced hammer design.
Compatible with all generations (safety latch may need to be removed in early gens)

VIDEOS

Corrosion-Resistant Coating

Advanced black nitride finish

Machined & Heat-Treated 4140 Body

Military-grade steel construction for maximum durability

Positive Positioning Detent

Precise 90° indexing with tactile feedback

Restricted States

This product cannot be shipped to the following states:

California
Connecticut
Colorado
Delaware
District of Columbia
Florida
Hawaii
Illinois
Maryland
Massachusetts
Minnesota
Nevada
New Jersey
New York
Oregon
Rhode Island
Virginia
Washington
US Territories
International

Legal Compliance

By purchasing this product, you acknowledge that you are legally permitted to own and possess it in your jurisdiction. It is your responsibility to ensure compliance with all federal, state, and local laws. The Atrius FRS is designed as a safety selector and must be used in accordance with all applicable firearms regulations. We are not responsible for misuse or violations of law.

Important Notice

This product is intended for lawful use only. Purchaser assumes all responsibility for legal compliance in their jurisdiction.

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