EXPERIENCE TRUE FREEDOM WITH OUR THREE POSITION FORCED RESET SELECTORS.
No modifications. No compromise. Complete drop-in ready solution.
Forced Reset Selectors
FRS vs. Standard Selector — What's Right for Your Build?
Atrius FRS
Standard Selector
Positions
3 positions: SAFE, SEMI, SUPER-SEMI
SAFE/SEMI only
Firing Speed
SAFE/SEMI only faster follow-up shots
Standard semi-auto rate
Bolt Carrier Wear
Reduces wear: mechanically leveraged design protects your BCG
Normal wear profile
Material
4140 Heat-treated steel: military-grade hardness
Cast metal or unknown alloy
Installation
Drop-in
Drop-in
Corrosion Resistance
Yes – specialized coating for rain, mud, sweat
Varies – may rust or corrode
Atrius FRS
Standard Selector
Positions
3 positions: SAFE, SEMI, SUPER-SEMI
SAFE/SEMI only
Firing Speed
SAFE/SEMI only faster follow-up shots
Standard semi-auto rate
Bolt Carrier Wear
Reduces wear: mechanically leveraged design protects your BCG
Normal wear profile
Material
4140 Heat-treated steel: military-grade hardness
Cast metal or unknown alloy
Installation
Drop-in
Drop-in
Corrosion Resistance
Yes – specialized coating for rain, mud, sweat
Varies – may rust or corrode
Compatibility Check
We've tested our Selector with dozens of AR15 platforms, parts, and accessories. See our complete compatibility matrix to see if your build is ready for the Atrius FRS.
*Works with Aero, ALG, BCM, FN, PSA, Rise Armament, and 25+ others
Build Guide
Follow our detailed guide to ensure proper fit and function.
Frequently Asked Questions
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The Atrius Forced Reset Selectors (Single-sided and Ambi) require MILSPEC triggers that have a squared off trigger bar at its rear end. Mil-spec triggers that have “U” notches and relief cuts are not compatible. Competition and cassette type triggers may or may not work due to their varying trigger bar designs. For our updated list of compatible triggers please see our product page descriptions or compatibility page.
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No! The Atrius FRS is a drop-in solution for many MILSPEC AR-15s. In general, you can drop this product into most AR15 rifles without any issue. However, if you have a custom or specialty build that requires some modifications, these should be done by a professional gunsmith. Atrius Development Group is not responsible for modifications done to your firearm or other parts as our Selectors are designed and intended to be a drop-in solution.
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In order for the Atrius FRS to function properly, you need to use a MILSPEC AR-15 lower receiver with a low shelf and a full profile trigger pocket. Ensure your bolt carrier group is full profile as well. If you are experiencing light strikes ensure that you are using an H2 or H3 buffer. Experimenting with different buffer springs may also help.
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No brand’s manufacturing process is perfect which is why there is always some level of “tolerance”. Tolerance stacking refers to the way variations in part dimensions add up which could lead to fitment and or function issues. For the Atrius FRS, tolerances between the lower and upper receivers, trigger, bolt carrier group, and gas/buffer system all play into this and contribute to whether your weapon platform is functioning properly or not.
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Our compatibility list is a constantly growing document and is not the end-all-be-all answer to everything! If you have a build that is functioning consistently but features parts not already listed in our public Master Compatibility Sheet, please let us know and we will add them to help other customers’ builds in our community as well.
