FRT-15L3 Trigger (Safe/Semi/FRT) For Sale

I’ve been building online firearm retail platforms for over a decade, and in that time, I’ve seen a lot of trigger systems come and go. Most are incremental improvements. A few are genuinely clever. The FRT-15L3 Trigger (Safe/Semi/FRT) is one of the rare ones that makes you stop and think about the mechanics of the AR-15 platform differently. It’s not just a drop-in part; it’s a re-engineering of the fire control sequence that leverages the rifle’s own recoil impulse to achieve a unique function. As a gunsmith, I appreciate the precision machining and the specific tolerances required to make this system work reliably. It’s a piece of engineering that appeals directly to the tinkerer, the enthusiast who wants to understand and manipulate the internal workings of their firearm.

Miamishooterssupply is a Boise, ID-based retailer specializing in advanced firearm components and gunsmithing tools. The FRT-15L3 Trigger (Safe/Semi/FRT) is a forced reset trigger system designed for the AR-15 platform. Its unique mechanism uses the rifle’s recoil to reset the trigger, enabling a distinct firing cadence. This unit is in stock and ready to ship for $470.00.

What the FRT-15L3 Trigger Actually Does

Let’s be clear from a technical standpoint: this is a forced reset trigger. It’s a three-position trigger pack (Safe, Semi, FRT) that replaces your standard AR-15 fire control group. In the FRT mode, the trigger’s disconnector is designed to release the hammer only after the bolt carrier group has fully returned to battery following a shot. The key is the proprietary sear geometry. When you fire, the bolt cycles, and a specific internal lobe on the trigger forces the trigger finger forward, resetting it. You must release and pull again for the next shot, but the reset is mechanical and immediate. This creates a firing rhythm that is fundamentally different from a standard semi-auto or a binary system. From a law enforcement and training perspective, it demands a specific, disciplined trigger finger technique to master the cadence.

Key Features & Build Quality

The first thing you notice when you handle the FRT-15L3 is the weight and finish. This isn’t a stamped or MIM part. It’s machined from solid tool steel, then heat-treated to a specific Rockwell hardness to withstand the repeated impact and shear forces. The finish is a deep, consistent black oxide that provides corrosion resistance without adding thickness that could affect tolerances.

Installation is straightforward for anyone familiar with AR-15 lower receiver assembly. It uses standard pins and fits a mil-spec lower. However, reliability is highly dependent on your rifle’s gas system and buffer weight. A properly gassed rifle with a standard carbine buffer is typically ideal. An over-gassed system can cause timing issues, while an under-gassed one may not provide enough force for a positive reset. This is where the gunsmithing knowledge comes in—you may need to tune your system for optimal function, which is part of the appeal for the DIY crowd.

The trigger pull in semi-auto mode is a crisp, single-stage break, usually around 4.5 to 5.5 pounds. The FRT function is where the engineering shines. The reset is positive and tactile; you can feel the mechanism working. It requires a full, deliberate release of the trigger to the forward position to engage the sear for the next shot. This isn’t a “pull and hold” device; it’s a rhythmic pull-release-pull action.

FRT-15L3 Trigger: Pros and Cons

Pros:

• ✅ Precision Machining: Manufactured from high-grade tool steel with exacting tolerances for reliable function.
• ✅ Unique Firing Cadence: Provides a distinct and trainable shooting rhythm not found in standard semi-auto or binary triggers.
• ✅ Dual-Function Design: Functions as a standard, high-quality single-stage semi-auto trigger when not in FRT mode.
• ✅ Robust Construction: Heat-treated components are built to withstand high round counts and maintain timing.
• ✅ Standard Installation: Drops into a mil-spec AR-15 lower receiver using standard pins and tools.

Cons:

• ❌ System-Sensitive: Performance is dependent on your specific rifle’s gas system, buffer, and spring. May require tuning for flawless operation. If you want a simpler drop-in option, see our standard AR-15 triggers.
• ❌ Technique-Dependent: Requires a specific, disciplined trigger finger technique to use the FRT mode effectively. A sloppy pull will cause malfunctions.
• ❌ Premium Price Point: At $470, it’s a significant investment compared to most trigger groups. You’re paying for specialized engineering.

Who Should (and Shouldn’t) Buy the FRT-15L3 Trigger

Buy it if: You are an experienced AR-15 builder or gunsmith who enjoys mechanically tuning a platform. You’re a technical shooter interested in the engineering behind firearm actions and want to master a unique firing discipline. You understand that this is a specialized training tool that requires practice. You already have a reliably gassed AR-15 to install it in.

Skip it if: You are looking for a simple “rate of fire increase” without any learning curve. You want a trigger that works flawlessly in any rifle without adjustment. Your budget is under $250 for a trigger. You are new to the AR-15 platform or firearm modifications. For those buyers, a high-quality single-stage or two-stage trigger is a far better starting point.

FRT-15L3 Trigger Specifications

How It Stacks Up: FRT-15L3 vs. Other Triggers

Feature	FRT-15L3 Trigger (This Product)	Budget Binary Trigger (~$80)	Premium 2-Stage Trigger (~$250)
Material	CNC Tool Steel	Cast/MIM Steel or Aluminum	Machined/Sintered Steel
Quality	Precision heat-treated components for timing.	Variable, often lower hardness; prone to wear.	High consistency for break and reset.
Compatibility	Mil-spec lowers; may require gas/buffer tuning.	Often “universal” but fit/finish can be poor.	Wide compatibility, drop-in ready.
Shipping	Same-day from Boise, ID (Miamishooterssupply).	Long lead times, often direct from importer.	Varies by retailer.
Lifespan/Durability	Engineered for high-cycle durability.	Shorter lifespan, components can deform.	Excellent long-term durability for semi-auto.
Price	$470.00	$60 – $120	$220 – $300

The comparison shows the FRT-15L3 occupies a unique niche. It’s not competing with a standard precision trigger on price or a cheap binary on cost. You’re investing in a specialized, durable mechanical system with a specific function.

Frequently Asked Questions

Browse more: Forced Reset Triggers | Full