(X-Series) Ambidextrous Forced Reset Selector
This is the Atrius Ambidextrous X-SERIES Forced Reset Selector. It's the latest addition to the FRS family which features a new trip system that has a slip base and slip clutch to allow for a universal fitment amongst gas piston platforms.
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
Compatibility
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.
Not Compatible
Some MPX's come with drop-in cassette style triggers that are not compatible with the FRS.
Geissele triggers designed for the MCX/MPX and the Atrius G-LEVER are not compatible.
MCX: The Two Stage Match Duo AR trigger from Sig is not compatible.
MCX: Some MCX's come with a skeletonized AR trigger from the factory. This trigger is not compatible due to the U-notch/relief cut on the rear of its trigger bar.
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
Install X-Series FRS as you normally would any other safety selector.
Install your fire control group (trigger).
Insert trip base on left side of the receiver and marry to rear trigger pin.
Insert trip clutch onto the track of trip base and push all the way forward.
Press trip base down so it's under rear takedown pin.
Ensure the entire trip hasn't shifted during previous steps.
Install upper receiver and dry function check.
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)
Compatibility Note
The FRS is drop-in compatible designed with mil-spec and full profile AR15 components. Check out our compatibility page for more information.
Ships In 9 Weeks Or Less
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