Description
The Atrius FRS Mil-Spec Super Safety, Atrius Development Group part number ADG-FRS-S-MS, is a three-position safety selector for the AR-15. It replaces your rifle’s standard two-position selector and adds a third forced reset position, with a traditional mil-spec style lever with ergonomic ridges and a position pointer, so it looks at home on retro and clone builds.
Atrius FRS Mil-Spec Super Safety Overview
Atrius Development Group designs its Forced Reset Selector, often called the Super Safety, as a self-contained upgrade. Instead of replacing the trigger, the forced reset function lives in the selector itself. The Atrius FRS Mil-Spec Super Safety is machined from heat-treated 4140 steel and finished in a corrosion-resistant black nitride, and it is made in the USA.
Three Positions
The selector has three positions: Safe, standard Semi, and the forced reset position. In Safe, the trigger is blocked like any AR-15 safety. In Semi, the rifle works exactly as it did before, so you can keep a conventional trigger feel whenever you want it. In the third position, a cam on the selector uses the rearward travel of the carrier to push the trigger forward and reset it, which shortens the reset time between shots. The rifle still fires one round for each function of the trigger.
Compatibility
The Atrius FRS Mil-Spec Super Safety is designed for mil-spec AR-15 lower receivers chambered in 223 Remington, 5.56 NATO and 300 Blackout. It is built to run with a mil-spec trigger with no relief cut. Atrius calls for a full-auto profile bolt carrier group so the carrier can work the selector cam, and some lowers need clearance in the rear of the fire control pocket. It is not intended for AR-10, LR-308 or SR-25 pattern rifles, and pistol-caliber AR builds may need professional fitting.
Buffer and Tuning
Forced reset systems depend on consistent carrier speed. For carbine-length buffer tubes and barrels of 16 inches or shorter, Atrius recommends at least an H2 buffer, with an H3 buffer preferred, while full-length rifle stocks should use the standard rifle buffer. Ammunition, gas system and suppressor use all affect timing, so test the rifle in the Semi position first, then confirm reliable resets in the third position before relying on it.
Installation
The selector is a drop-in part for most rifles, though some minor fitting may be required. Remove the pistol grip and your existing selector, install the Atrius selector and its detent spring, and secure the lever screw with a T10 driver. Atrius specifies 15 inch-pounds of torque with blue Loctite on the 4-40 screw. Function check every position before firing. If you are not comfortable working on your rifle, have a qualified gunsmith install it.
Laws and Compliance
Forced reset devices remain the subject of ongoing federal litigation, and some states and localities restrict or prohibit them. Check your state and local laws before you order, install or travel with one. We will not ship this product to any location where it is prohibited.
Specifications
- Brand: Atrius Development Group
- Model: Forced Reset Selector (FRS), mil-spec style lever
- Part number: ADG-FRS-S-MS
- Positions: Safe, Semi, forced reset
- Material: heat-treated 4140 steel
- Finish: black nitride
- Platform: mil-spec AR-15 (223 Rem, 5.56 NATO, 300 Blackout)
- Trigger: a mil-spec trigger with no relief cut
- Carrier: full-auto profile
- Screw: 4-40, T10, 15 in-lb
- UPC: 850079014084
- Made in the USA
Before You Buy
Read the host rifle requirements before ordering: the correct trigger, a full-auto profile carrier and the right buffer are needed for reliable function. Forced reset parts are not legal everywhere, so confirm the rules where you live first.
Who It Is For
The Atrius FRS Mil-Spec Super Safety is a great fit for builders who want forced reset function while keeping a classic, mil-spec look on their AR-15.
Buy the Atrius FRS Mil-Spec Super Safety at MAG5 Firearms
MAG5 Firearms is a family-owned FFL in Collegeville, Pennsylvania. Order the Atrius FRS Mil-Spec Super Safety online and we will ship it to you where state and local law allow, or browse our full selection of AR lower parts for more AR-15 upgrades. See more from Atrius Development Group.
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