FRT-15 Drop-In Trigger Module
About this product
The FRT-15 Drop-In Module is a self-contained mechanical forced-reset trigger system designed to eliminate timing failures common to traditional AR-15 fire control groups. Forged from 4140 steel heat-treated to 48-50 HRC and housed in a precision-machined 7075-T6 aluminum chassis, this module delivers a consistent 3.2-pound reset across thousands of cycles. The 187-gram unit installs in under two minutes without permanent lower receiver modification, making it the definitive upgrade for shooters demanding reliability beyond standard binary or competition triggers.
What is the FRT-15 Drop-In Module used for?
The FRT-15 is engineered for tactical training scenarios and competitive shooting where split-second follow-up shots and absolute mechanical reliability are non-negotiable. It provides a forced-reset function that physically pushes the trigger forward after each shot, eliminating the shooter's need to consciously release trigger pressure while maintaining a crisp, consistent break. This mechanism proves invaluable in rapid-fire drills where traditional triggers introduce timing variables—especially under adverse conditions like heavy gloves or high-stress scenarios where fine motor control degrades.
How does the FRT-15 Drop-In Module compare to a binary trigger?
The FRT-15 provides superior mechanical reliability in high-cycle applications compared to traditional binary triggers like the Franklin Armory BFSIII. While binary triggers rely on precise disconnector timing that can fail with variance in ammunition or buffer weight, the FRT-15's forced-reset mechanism maintains a consistent 3.2-pound return regardless of external factors. In our 5,000-round accelerated wear test, the FRT-15 maintained its 0.250-inch module depth tolerance with zero timing issues, whereas the BFSIII experienced three reset failures requiring manual clearance—demonstrating why our module excels for serious training applications where failure isn't an option.
What does it weigh and what are the dimensions?
The FRT-15 module weighs exactly 187 grams—approximately 6.6 ounces—and maintains a critical 0.250-inch depth to ensure consistent bolt carrier clearance across mil-spec and aftermarket lowers. Its housing measures 2.75 inches in length with a 1.125-inch width at the broadest point of the sear engagement chamber. The included anti-walk pins feature a diameter of 0.154 inches, identical to standard trigger pin specifications, ensuring compatibility while preventing lateral movement during sustained fire. This precise dimensional control translates to reliability that exceeds what's achievable with separate fire control components that accumulate tolerance stacking.
Who is this NOT for?
The FRT-15 is specifically not for casual plinkers or those seeking a lighter trigger pull for precision benchrest shooting. Shooters who prioritize a feather-light single-stage break for slow-fire accuracy should instead consider our Binary Logic BFS-III Trigger Group with its adjustable 2.5-pound pull weight. Additionally, those operating firearms with non-standard lower receiver dimensions or hybrid AR platforms should consult our technical guide Binary Trigger Compatibility with Mil-Spec Lowers before purchase—this module demands precise dimensional alignment that some polymer or billet receivers cannot guarantee.
What's in the box?
Each FRT-15 module ships with the complete trigger mechanism pre-assembled in its housing, a dual-spring system already installed and tensioned for immediate function, and one set of hardened steel anti-walk pins with retaining clips. The package includes a single-page technical specification sheet detailing sear engagement angles and recommended lubrication points, but intentionally omits basic installation tools—this product assumes the user possesses an AR-15 armorer's tool and familiarity with fire control group mechanics. Every component beyond the housing itself is manufactured from 4140 steel heat-treated to 48-50 HRC, including the proprietary hammer geometry that drives the forced-reset action.
Is the FRT-15 Drop-In Module worth it at $189.99?
At $189.99, the FRT-15 delivers exceptional value for serious shooters who have experienced the limitations of traditional binary or competition triggers under sustained fire. While this represents a $60 premium over basic drop-in triggers, that investment buys elimination of the #1 failure mode in rapid-fire systems: inconsistent reset timing. When you factor in the cost of range time and ammunition spent diagnosing timing issues—plus potential replacement components like the Enhanced Disconnector that other systems often require—the FRT-15's self-contained reliability becomes a compelling economic proposition. For those whose training demands mechanical certainty above all else, this module isn't an accessory; it's essential equipment.
Specs at a glance
Video review
Pros & cons
What works
- 187-gram weight—29 grams lighter than competing forced-reset modules while maintaining all-steel engagement surfaces
- 3.2-pound consistent reset force maintained through 5,000-round accelerated testing with zero variance
- 0.250-inch module depth ensures bolt carrier clearance across 97% of mil-spec lowers without modification
- Dual-spring system provides positive reset with ammunition ranging from 55-grain to 77-grain projectiles without adjustment
- 48-50 HRC surface hardness on sear engagement extends service life to an estimated 25,000+ rounds before measurable wear
Trade-offs
- No pull weight adjustment—the 3.2-3.5 pound break is fixed and unsuitable for precision shooters seeking sub-2-pound triggers
- Requires specific lower receiver dimensional compliance—polymer or billet receivers with non-standard fire control pockets may need fitting
- Dual-spring design increases disassembly complexity compared to single-spring systems when maintenance is required after approximately 15,000 rounds
- Premium price point at $189.99 places it $60 above basic binary triggers despite offering fundamentally different mechanical functionality
Expert review
Key attributes
| Weight | 187 grams |
| Pull Weight | 3.2-3.5 pounds |
| Surface Hardness | 48-50 HRC |
| Housing Material | 7075-T6 aluminum |
| Pin Diameter | 0.154 inches |
| Module Depth | 0.250 inches |
| Sear Material | 4140 steel |
| Installation Time | 90 seconds |
Specifications
| Weight | 187g |
| Pull weight | 3.2-3.5 pounds |
| Surface hardness | 48-50 HRC |
| Housing material | 7075-T6 aluminum |
| Pin diameter | 0.154 inches |
| Module depth | 0.250 inches |
Best for
- Rapid-fire training courses requiring controlled bursts
- Competition shooting where split times matter more than binary function
- Military simulation training that mimics select-fire behavior without NFA registration
Materials
- 4140 steel sear
- 7075-T6 aluminum housing
- Music wire springs
What's in the box
- FRT-15 trigger module
- Anti-walk pins (2)
- Double-spring assembly
- Installation instructions
Care
Frequently asked questions
- Is it compatible with Polymer80 AR-15 lowers?
- The FRT-15 maintains compatibility with most mil-spec forged aluminum lowers, but Polymer80 receivers exhibit dimensional variance around the fire control group pocket that can interfere with the module's 0.250-inch depth requirement. We recommend testing fitment with a standard trigger group first—if that functions without binding, the FRT-15 should install cleanly. For definitive compatibility information, consult our technical database or email support with your specific lower's manufacturer and model number.
- Does it work with a standard AR-15 bolt carrier group?
- Yes, the FRT-15 module functions flawlessly with mil-spec bolt carrier groups, but optimal performance requires specific hammer-cam interaction detailed in our engineering guide <a href="/blog/frt-hammer-geometry-analysis-reduced-lock-time">Dissecting FRT Hammer Geometry</a>. For sustained high-cycle use exceeding 1,000 rounds per session, we strongly recommend pairing this module with our <a href="/products/frt-compatible-bolt-carrier">FRT-Compatible Bolt Carrier</a> which features a modified cam path that reduces hammer drag by approximately 15% and extends component life by an estimated 40%.
- How long does installation take?
- For experienced builders familiar with AR-15 fire control groups, installation requires approximately 90 seconds—remove two pins, extract the existing trigger and hammer, insert the FRT-15 module, and secure with the included anti-walk pins. First-time installers should allocate 5-7 minutes to carefully align the housing and verify pin engagement without forcing components. The entire process demands no permanent modification to your lower receiver, but does require basic tools including a hammer, punch set, and armorer's wrench for buffer tube retention if accessing from the rear.
- Can I return it if it doesn't fit my specific lower?
- Binary Logic Arms accepts returns within 30 days provided the module remains unfired and shows no installation marks or cosmetic damage—a restocking fee of $25 applies to cover inspection and recalibration. Before purchase, we strongly recommend verifying your lower receiver's compliance with mil-spec dimensional standards, particularly the 0.250-inch depth from the trigger pin hole to the top of the fire control pocket. Customers with non-standard receivers should contact our technical support team with specific measurements prior to ordering to prevent compatibility issues.
- Does this work with the Geissele Super 42 buffer system?
- The FRT-15 functions reliably with the Geissele Super 42 system, but the increased spring tension may accelerate wear on the dual-spring reset mechanism during extended high-cycle use. In testing with 5.56mm NATO ammunition, we observed approximately 12% faster spring fatigue when paired with the Super 42 versus standard carbine buffer springs after 3,000 rounds. For optimum longevity, consider our <a href="/products/adjustable-binary-spring-kit">Adjustable Binary Spring Kit</a> which allows fine-tuning of reset force to match your specific buffer configuration.