The Rare Breed FRT 15 E3 Trigger provides a mechanical reset advantage for AR-15 builds, offering three distinct modes that balance speed with control. This isn’t a binary trigger—it’s a precision-engineered system that shortens lock time while maintaining positive reset feedback.
What you get
- Three-mode operation: Safe (full lockout), Semi (standard single-stage pull), Hard Reset (short-travel mechanical reset)
- CNC-machined 4140 steel trigger and hammer with black oxide finish
- Tool-less selector switch for mode changes
- Precision ground sear surfaces for consistent break
- Includes anti-walk pins and all necessary springs
- Designed for mil-spec AR-15 lower receivers
Build and finish
The FRT 15 E3 starts with 4140 chromoly steel components hardened to 50-52 HRC, with critical engagement surfaces ground to ±0.0005″ tolerances. Unlike cast or MIM triggers, this one-piece design eliminates weak points at the hammer pivot and trigger bow.
Black oxide treatment provides corrosion resistance without adding thickness to bearing surfaces. The selector lever uses a positive detent system—no set screws to work loose under recoil. All springs are chrome silicon for consistent tension through temperature extremes.
Compatible platforms
- Mil-spec AR-15 lowers (commercial-spec may require fitting)
- Polymer80 AR-15 frames with standard FCG pockets
- Most billet lowers with unmodified trigger groups
- Not compatible with drop-in cassette triggers or Colt-style sear blocks
Installation notes
Installs like any mil-spec trigger group, though the selector detent may require slightly more pressure during assembly. Function test all modes before live fire—the Hard Reset position requires deliberate forward pressure on the trigger to engage.
For builders working with Polymer80 frames, this trigger pairs well with enhanced bolt catches and ambi controls to create a purpose-built speed platform. The mechanical reset gives tactile feedback that compensates for polymer frame flex during rapid strings.
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