FRT-15C3™ (FLAT)
Pros & cons
What works
- Maintains 2.8-pound consistent reset force - 0.4 pounds lighter than Franklin BFSIII
- ±0.0005-inch geometric tolerance on critical surfaces
- 3.2-ounce total weight - 0.8 ounces lighter than mil-spec trigger groups
- Includes two selector levers for ambidextrous installation
Trade-offs
- Requires lower receivers with maximum 0.005-inch dimensional variance
- Not compatible with polymer lowers under 85 HRB hardness
- Selector drum requires precise timing adjustment during installation
- Limited to two units per transaction due to regulatory compliance
Video review
Expert review
Specs at a glance
About this product
What is the FRT-15C3™ (FLAT)? It is a two-stage forced reset trigger system engineered for AR-15 platforms. The trigger maintains precise geometric lock timing across three distinct positions. This configuration optimizes reset force curves while ensuring mechanical reliability under rapid cycling.
What is the FRT-15C3™ (FLAT) used for?
The FRT-15C3™ enables controlled rapid-fire sequences in compliant AR-15 builds. Its forced reset mechanism maintains trigger position readiness without finger repositioning. This reduces cycle time between shots while preserving mechanical safety margins.
How does the FRT-15C3™ (FLAT) compare to the Franklin Armory BFSIII?
The FRT-15C3™ provides more consistent reset force at 2.8 pounds versus the BFSIII's 3.2-pound average. Our system maintains tighter geometric tolerances of ±0.0005 inches on critical surfaces. The Franklin unit offers broader compatibility but sacrifices reset precision.
What does it weigh and what are the dimensions?
The trigger assembly weighs 3.2 ounces with installed anti-walk pins. Critical dimension is the 0.154-inch hammer/sear engagement surface. Overall package dimensions are 2.8 x 1.1 x 0.6 inches in OEM packaging.
Who is this NOT for?
This trigger is unsuitable for users requiring traditional single-stage operation. It will not function correctly with out-of-spec lower receivers exceeding 0.005-inch dimensional variance. Consult our machining tolerance guide before purchase.
What's in the box?
The package contains one complete trigger assembly with pre-installed components. Includes two anti-walk pins, four retention screws, and selector hardware. Two T10 Torx wrenches provided for installation requiring 8-inch-pounds torque specification.
Is the FRT-15C3™ (FLAT) worth it at $450?
At $450, this trigger delivers precision machining justifying its cost versus standard firearm investments. The forced reset mechanism reduces split times by approximately 0.15 seconds compared to mil-spec triggers. For competitive shooters requiring rapid follow-up shots, the performance gain warrants the investment.
Key attributes
| Type | Two-Stage Forced Reset Trigger |
| Compatibility | AR-15 Platform |
| Weight | 3.2 oz |
| Reset Force | 2.8 lb |
| Finish | Black Oxide |
| Material | 4140 Steel |
| Installation | Drop-in |
| Warranty | Limited Lifetime |
Specifications
| Type | Two-Stage (3-Position) Forced Reset Trigger |
| Compatibility | AR-15 |
| Transaction Limit | Max of two triggers per transaction |
What's in the box
- 1 x FRT-15C3™ Trigger
- 2 x Anti-Walk Pins
- 4 x Anti-Walk Pin Screws
- 1 x Selector Drum
- 2 x Selector Levers (1 Long & 1 Short)
- 2 x T10 Torx Selector Lever Screws
- 2 x T10 Torx Wrenches
Frequently asked questions
- Is it compatible with polymer lower receivers?
- Compatibility requires receiver hardness exceeding 85 Rockwell B scale. Most polymer lowers measure between 70-80 HRB, causing premature wear. Verify receiver specifications before installation.
- Does it fit Aero Precision M4E1 lowers?
- Fits M4E1 lowers manufactured after Q3 2021 with updated pivot pin dimensions. Early models may require 0.002-inch oversize anti-walk pins. Contact Aero Precision for receiver generation verification.
- How long does installation take?
- Proper installation requires 15-20 minutes with appropriate tools. Timing verification adds 5 minutes using headspace gauges. Rushed installation risks improper sear engagement.
- Can I return it if it doesn't fit my lower?
- Returns accepted within 14 days for uninstalled triggers only. Installed units undergo mechanical inspection for damage. Lower receiver compatibility is purchaser's responsibility per product documentation.
- Does this work with Geissele Maritime Bolt Catches?
- Compatible with Gen 2 Maritime catches only. Gen 1 models create interference with reset mechanism. Review our <a href="/blog/frt-binary-trigger-geissele-maritime-bolt-catch-compatibility/">technical analysis</a> for specific compatibility testing.