Atrius FRS Super Safety Ambidextrous 3-Position AR-15 Safety Selector

Atrius Ambidextrous Forced Reset Selector (FRS) — Super Safety

Positions: SAFE / SEMI (Traditional) / SUPER-SEMI (Ambidextrous)

Key Features

• Ambidextrous 3-position design (SAFE / SEMI / SUPER-SEMI)
• Ultra-smooth engagement with crisp, tactile 90° clicks
• Positive, non-slipping positioning
• Heat-treated 4140 steel with corrosion-resistant finish
• Mechanically leveraged design intended to reduce wear versus some forced-reset triggers
• Drop-in installation (replaces factory safety on compatible lowers; some fitment may be required)
• Made in the USA

Compatibility & Fitment

• Designed for mil-spec AR-15 fire control groups (.223 / 5.56 / .300 BLK)
• NOT compatible without gunsmithing on AR-10 (LR-308/SR-25) platforms
• Some AR9 and non-standard platforms may require professional gunsmithing for correct function
• Works best with lowers that have an FA pocket or low shelf and mil-spec triggers without a relief cut (trigger rear must be squared; no U-notch)
• Requires an FA style bolt carrier group
• Buffer guidance:
  • Minimum H2 buffer (H3 recommended) for carbine extensions with 16" or shorter barrels
  • Standard rifle buffer for 20" A2 stocks

Installation & Hardware

• Selector screw: T10, 4-40 thread
• Recommended spring: McMaster-Carr 9657K619
• Torque spec: 15 in-lbs (use blue Loctite only)
• Check function and safety with dummy rounds before live fire; use a qualified gunsmith if unsure

Operational Notes

• Super-Safety uses a dovetail cam with about 15° tolerance, which may allow limited over-travel before the cam disengages from the trigger bar (design behavior, not a defect)

Technical Summary

• Material: Heat-treated 4140 steel
• Finish: Corrosion-resistant coating