Atrius FRS · Forced Reset · Super-Semi
One Horse Express · Built To Run™
Searching for a forced reset selector, the Atrius FRS, or Super-Semi on an AR-15? Every One Horse Express ships with the Atrius Forced Reset Selector (SAFE, SEMI, Super-Semi) fit, timed and tested at our factory in Brownstown, Indiana. No drop-in gamble.
A forced reset selector replaces the AR-15 safety selector, not the trigger. The Atrius FRS has three positions: SAFE, SEMI and Super-Semi. Every One Horse Express rifle and pistol ships with the Atrius FRS installed, tuned and tested at our factory in Brownstown, Indiana. Building your own? Start with a One Horse low shelf lower.
One Horse Express hub
16″ 5.56/.223 with the Atrius FRS. Black, M81 Camo, America 250, OD Green.
10.5″ 5.56/.223, M-LOK or quad rail. 21+.
16″ rifle and 12″ pistol in .22 LR.
What Super-Semi does and why we fit, tune and test every Express.
H1, H2 and H3 weights, and which one to start with.
Stripped or complete, for your own forced reset build.
Published October 13, 2026 · Updated October 25, 2026 · By One Horse, Brownstown, Indiana
The short answer
A forced reset selector replaces the safety selector in a compatible AR-pattern firearm. It does not replace the whole trigger or fire control group. The one we install is the Atrius Development Group Forced Reset Selector (FRS).
It has three positions: SAFE, SEMI and Super-Semi. Super-Semi is the forced reset position. As the bolt carrier cycles, the selector returns the trigger to its ready position after each shot.
Want the full breakdown? Read our Atrius FRS guide.
“Super safety” is a common shopper term for a selector-style part that adds a forced reset position to an AR-15. The Atrius FRS is a forced reset selector in that category.
FRT vs FRS
Shoppers use “forced reset trigger” and “FRT” for the whole category. Here’s how a trigger-style device and the Atrius selector differ.
| Forced reset trigger (FRT) | Atrius forced reset selector (FRS) | |
|---|---|---|
| What it replaces | The trigger / fire control group | The safety selector |
| Works with | Its own trigger parts | A compatible fire control group |
| Positions | Set by the device | SAFE, SEMI and Super-Semi |
| Needs a matched system | Yes: lower, carrier, gas and buffer | Yes: lower, carrier, gas and buffer |
| One Horse option | Low shelf lowers that accept multiple FRS and FRT style devices | Factory-installed and tuned in every Express |
Buyer question
Atrius designed the FRS as a drop-in for compatible AR-pattern firearms. But “drop-in” describes how the selector installs. It doesn’t mean every mix of parts is already balanced. A forced reset device depends on the whole rifle working as one system:
Reliability
On a DIY build, that means troubleshooting one part at a time: another buffer, another spring, a different fire control group, a compatible bolt carrier, even another lower receiver. Add the ammo burned diagnosing it and any gunsmith fees. On an Express, that tuning work is already done.
Side by side
Same Atrius forced reset selector, same Super-Semi position. Very different amount of work on your end.
| Step | DIY selector install | One Horse Express |
|---|---|---|
| Parts | You source the selector, fire control group, carrier, buffer and spring, and confirm your receiver fits. | Atrius FRS and compatible core parts, picked to work as one system. |
| Fit & timing | Tolerance stacking, gas timing and buffer setup are on you. | Fitted, timed and tuned for each Express platform. |
| Testing | Your own install, function checks and live-fire. | Function-tested and live-fire validated by One Horse. |
| Day one | A tuning project. | Pick it up from your FFL. Load it. Run it. |
Building your own?
The One Horse AR15 Mil-Spec Lower Receiver is a forged 7075-T6, low shelf lower that accepts multiple FRS and FRT style devices. The AR15 Complete Lower Receiver is the same low shelf lower, assembled with stock, grip and buffer tube. See the low shelf lower guide. Compare both on our AR-15 lower page.
SKU: OH-LR02
SKU: OH-CL01
Lowers ship to your FFL dealer. Check your federal, state and local laws on triggers and selectors before you buy.
One Horse Express · Built To Run™
One Horse Express is our Built To Run™ lineup of AR-15 rifles and pistols with the Atrius Forced Reset Selector factory-installed, tuned and test fired. We work with Atrius so every Express leaves the line with the same forced reset system.
SKU: OHX-AI01
SKU: OHX-AI01-2
SKU: OHX-AI01-1
SKU: OHX-AI01-3
SKU: OHX-APS01
SKU: OHX-APQ01
SKU: OH-TT02
SKU: OH-TT01
Every Express ships free to your FFL dealer. Rifles 18+ (21 where state or local law requires it). Pistols 21+. Limited Lifetime warranty.
Questions
A forced reset selector replaces the AR-15 safety selector instead of the whole trigger. The Atrius Development Group Forced Reset Selector (FRS) has three positions: SAFE, SEMI and Super-Semi, the forced reset position.
A forced reset trigger (FRT) is a trigger-style device that goes in the fire control group. The Atrius FRS is a selector: it replaces the safety selector and works with a compatible fire control group. Both are forced reset designs.
No. The Atrius FRS is a selector, not a forced reset trigger (FRT). It replaces the safety selector and works with a compatible fire control group.
Super-Semi is the forced reset position on the Atrius FRS. As the bolt carrier cycles, the selector returns the trigger to its ready position after each shot. SEMI works like a regular AR-15.
“Super safety” is a common shopper term for a selector-style part that adds a forced reset position to an AR-15. The Atrius FRS is a forced reset selector in that category.
It’s designed as a drop-in for compatible AR-pattern firearms, but drop-in describes the install, not the tuning. An Express skips the guesswork because the forced reset tuning is done before it ships.
Most issues trace back to tolerance stacking, an under- or over-gassed system, a carrier that isn’t full profile, or a buffer and spring that doesn’t match the gun. Forced reset relies on the action cycling correctly.
One that has room for it. The One Horse mil-spec stripped lower is a low shelf lower that accepts multiple FRS and FRT style devices. The complete lower is too. See AR-15 lowers.
Every One Horse Express ships with the Atrius FRS factory-installed, tuned and tested in Brownstown, Indiana: 16″ 5.56/.223 rifles, 10.5″ 5.56/.223 pistols, and dedicated .22 LR models.
Pick your model on the Express page, buy online and we ship to your FFL dealer for transfer. Rifles 18+ (21 where required), pistols 21+.
Laws vary by state and city and can change. It is the buyer’s responsibility to know and follow federal, state and local laws where they live and where they shoot, including rules on triggers and selectors. Placing an order does not mean an item is legal where you live. This page is product information, not legal advice.
Family Owned · Veteran Owned · Built in Indiana
Atrius forced reset selector with Super-Semi, fit, timed and tested at the factory.
Federal, state and local laws vary and change, and it is the buyer’s responsibility to follow them. Questions? Call 812-200-0305 or email customerservice@theonehorse.com.
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