(Mil-Spec) Atrius Forced Reset Selector

(3 reviews)

This is the Atrius Mil-Spec FRS (single side) featuring a mil-spec selector switch and a traditional design that looks great, especially if you're working on a retro build.

It's the most robust solution on the market that enables the user to have 3 positions; SAFE, SEMI (Traditional) and SUPER-SEMI. This Forced Reset Safety (FRS) is compatible with mil-spec/full-profile AR15 (chambered in .223/5.56/.300 BLK) fire control groups with no modifications required.

*Packaging will come with a black Atrius bag, the same as our original single-sided FRS. Please be aware of scams and copies on the market.

$199.00

Current Stock:

Ships within 1-3 business days

Availability: Limited to 10 units per purchase

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Manufactured In USA

PRODUCT SPECIFICATIONS

Precision-engineered from heat-treated 4140 steel, the Atrius Mil-Spec FRS delivers uncompromising performance in a drop-in package. Experience forced reset technology without the wear and complexity of traditional FRT systems.

Features

Style: Mil-spec w/ Ergonomic Ridges & Pointer for Position Reminder
Configuration: Safe | Semi | Super-Semi
Compatibility: Mil-Spec AR15 (.223/5.56/.300 BLK)
Installation: Drop-In Ready (No Modifications Necessary)
Made in the USA

Materials

Finish: Corrosion-Resistant Black Nitride
Material: 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

Mil-spec style switch. Your fingers will find the familiar selector instantly, even under stress.

Atrius Forced Reset Selectors

Product Comparison

Product

Single Switch

Ambi Switch

Lever Blocker

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

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.

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.

Product Reviews

from 3 reviews

5.0

4.0

3.0

2.0

1.0

Review Lists

Robert Gerken

Jun 7th 2026

Perfect fit

Super simple install and works like a champ.
Caleb Merritt

Jun 1st 2026

Fun Time

First off! Let me start by saying delivery was fast! I ordered on a Monday night and had it by Friday afternoon. Installing it was quite easy but I’m also a AR BUILDER and it runs flawless so far! I love it Will be purchasing more for my rifles and PCC
Petack

May 21st 2026

Works well

I have this in a PSA 11.5. I'm running their EPT trigger. It ran very well. 400 rounds in. I switched over to a springco Blue spring after I was getting very forward. Ejection. No malfunctions though. Runs very well with that and an H2.