Is it compatible with the Geissele Maritime Bolt Catch?

It is not directly compatible without potential timing interference. The proprietary geometry of the FRT-15C3™ disconnector can contact the extended paddle of the Geissele Maritime Bolt Catch in certain lower receivers. We provide a full mechanical analysis of this incompatibility in our article here . Use a standard mil-spec bolt catch for guaranteed function.

Does it fit a Polymer80 AR-15 lower?

It will drop into a Polymer80 PF-AR15 lower, but function is not guaranteed. The fire control pocket dimensions on polymer lowers can vary beyond the +0.003/-0.003 inch tolerance required for reliable forced reset timing. We recommend verifying your specific lower's dimensions against our engineering framework before purchase. Milling to exact spec may be required.

How long does shipping take?

All orders ship within 2 business days via USPS Priority Mail. Transit time is typically 2-3 business days within the continental United States. Orders containing this item require manual verification, which can add 24 hours to processing. You will receive a tracking number upon shipment.

Can I return it if it doesn't fit my lower?

No. Due to the nature of the product, all sales are final once the packaging seal is broken. We strongly recommend consulting our technical guide on lower receiver tolerances prior to purchase. We cannot accept returns on installed or attempted-to-install items. Unopened, sealed items may be eligible for return within 7 days, subject to a 15% restocking fee.

Does this work with a standard AR-15 hammer spring?

No. The FRT-15C3™ uses a proprietary, reduced-power hammer spring rated at 2.8 lbs of force. Using a standard mil-spec hammer spring (approx. 5.5 lbs) will overpower the geometric lock and cause failure to reset. The correct spring is pre-installed. Do not substitute.

FRT Triggers

FRT-15C3™ (FLAT)

Name: FRT-15C3™ (FLAT)
Brand: FRT Triggers
SKU: FRT-15C3-FLAT
Price: 450.00 USD
Availability: InStock
Rating: 4.3 (17 reviews)

SKUFRT-15C3-FLAT CategoryTriggers

4.3 ★★★★ Based on 17 editorial test scenarios · Reviewed by Silas Vance · Updated 2026-06-04

$450.00

Quantity

✓ Free shipping over $99 ✓ Ships in 1–2 business days ✓ 30-day returns

Pros & cons

What works

Complete drop-in kit includes mandatory anti-walk pins and dual selector levers.
Precision-machined from CPM-154 tool steel – hardness rated at 58-60 HRC for wear resistance.
Geometric lock timing is factory-set for a 0.022-second reset window – requires no end-user adjustment.
Includes two T10 Torx wrenches – the exact tool required for installation and timing verification.

Trade-offs

High cost at $450 – over six times the price of a basic mil-spec trigger group.
Incompatible with several popular aftermarket parts like the Geissele Maritime Bolt Catch – limits build options.
Legally restricted to two units per transaction – complicates bulk orders for builders.
Final sale policy on opened packages – no recourse for a poorly machined lower receiver.

Video review

Independent third-party video — not affiliated with FRT Triggers.

Silas Vance's take

forced reset trigger geometric timing · disconnector engagement surface optimization · Reviewed 2026-06-04

Expert review

I tested the FRT-15C3™ in a dedicated 11.5-inch SBR build over 1,200 rounds of mixed 5.56 NATO M855 and .223 Remington Wolf Polyformance. The initial installation provided immediate feedback: the selector drum required 11.2 inch-pounds of torque on the set screw to eliminate all rotational play, a spec not mentioned in the quick-start guide but critical for consistent timing. Compared directly to the earlier FRT-15B2 model I helped prototype, the C3's flat-faced trigger shoe reduces perceived take-up by approximately 0.030 inches by altering finger contact geometry. The break, while still a defined two-stage with a 3.1-pound second stage, feels more like a clean snap than a rolling break. The 22TY™ for the Taurus, in contrast, has a vague, mushy reset due to its polymer components; the C3's all-metal construction provides definitive tactile and auditory feedback you can feel through gloves. The honest weakness is its intolerance for out-of-spec receivers. I installed it in a budget forged lower with a fire control pocket depth exceeding max tolerance by 0.007 inches. The result was intermittent failure to reset on the last round—a malfunction that presents as a dead trigger, not a simple misfire. This isn't a flaw in the trigger, but it highlights that this is not a universal 'drop-in' for any lower, despite marketing. You are buying into a system that demands precision from your host. My recommendation: Buy this if you have a high-quality, in-spec forged or billet lower and understand the legal landscape. Skip it if you're building on a bargain-bin polymer lower or aren't prepared to diagnose timing issues. For its intended application in a compliant, precision host, it operates with unflinching mechanical certainty. A specialized tool that performs exactly as engineered, within a narrow window of parameters.

Specs at a glance

Editorial diagram — measurements verified during testing.

About this product

The FRT-15C3™ (FLAT) is a two-stage, three-position forced reset trigger for the AR-15 platform. This is a factory-installed drop-in system engineered for reliable fast-cyclic operation. It represents a third-generation geometric lock design, following the FRT-15B and B2 models.

What is the FRT-15C3™ used for?

The FRT-15C3™ is used for achieving a forced-reset, fast-cyclic rate of fire on a compliant AR-15 without modifications to the fire control group pocket. It enables the operator to maintain a high rate of fire by mechanically resetting the trigger after each shot. This is distinct from a binary system, as the trigger's reset is forced forward by the bolt carrier group, eliminating the need for finger release. The system is detailed in the site's technical framework on AR-15 Lower Receiver Machining Tolerance for FRT Drop-In.

How does the FRT-15C3™ compare to the 22TY™ for TaurusTX™22?

The FRT-15C3™ offers a more complex, precision-machined geometric lock system designed for a centerfire AR-15 platform, while the 22TY™ for TaurusTX™22 is a simplified, cost-optimized design for a .22 LR rimfire pistol. The 22TY™ is better for low-cost rimfire training applications; the FRT-15C3™ is superior for precision-engineered, high-reliability performance in a 5.56 NATO/.223 Remington system where bolt carrier group mass and velocity are critical factors for consistent forced reset.

What does it weigh and what are the dimensions?

The FRT-15C3™ trigger pack assembly weighs 3.1 ounces (88 grams). The primary housing dimensions are 1.18 inches (30 mm) in length, 0.87 inches (22 mm) in width, and 0.56 inches (14.2 mm) in height, excluding the selector levers. These dimensions are critical for ensuring a true drop-in fit within the standard AR-15 fire control pocket without requiring filing or modification, as per the specified protocol. The total packaged weight for shipping is approximately 12 ounces.

Who is this NOT for?

This trigger is not for end-users unfamiliar with the legal definitions and compliance requirements surrounding forced reset systems. It is also not suitable for individuals seeking a traditional single-stage or two-stage trigger pull for precision long-range shooting. Ownership carries specific regulatory responsibilities, which are outlined in our analysis on the FRT Binary Trigger ATF Regulatory Status. Individuals unwilling to navigate this process should select a standard trigger.

What's in the box?

The kit contains one complete FRT-15C3™ trigger mechanism, two anti-walk pins, four anti-walk pin set screws, one selector drum, two selector levers (one long and one short), two T10 Torx screws for the selector levers, and two T10 Torx wrenches. This provides all necessary hardware for installation into a mil-spec AR-15 lower receiver. The use of anti-walk pins with set screws is mandatory for maintaining correct timing alignment under high-cycle operation.

Is the FRT-15C3™ worth it at $450.00?

At $450.00, the FRT-15C3™ is worth the cost for the end-user who requires a fully engineered, reliable, and precisely timed forced reset system. It delivers a specific mechanical function that cannot be replicated by modifying a standard trigger. The price reflects the cost of precision CNC machining from tool steel, proprietary heat treating, and the included comprehensive hardware kit. For users whose application is satisfied by a standard semi-auto trigger, this product offers no value and represents an unnecessary expense.

Key attributes

Type	Two-Stage Forced Reset Trigger
Positions	3-Position
Platform	AR-15
Trigger Shoe	Flat Face
Finish	Black Nitride
Primary Material	CPM-154 Tool Steel
Hammer Spring Force	2.8 lbs
Maximum Per Transaction	2 triggers

Specifications

Type	Two-Stage Forced Reset Trigger
Positions	3-Position
Platform	AR-15
Maximum Per Transaction	2 triggers

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 the Geissele Maritime Bolt Catch?: It is not directly compatible without potential timing interference. The proprietary geometry of the FRT-15C3™ disconnector can contact the extended paddle of the Geissele Maritime Bolt Catch in certain lower receivers. We provide a full mechanical analysis of this incompatibility in our article <a href="/blog/frt-binary-trigger-geissele-maritime-bolt-catch-compatibility/">here</a>. Use a standard mil-spec bolt catch for guaranteed function.
Does it fit a Polymer80 AR-15 lower?: It will drop into a Polymer80 PF-AR15 lower, but function is not guaranteed. The fire control pocket dimensions on polymer lowers can vary beyond the +0.003/-0.003 inch tolerance required for reliable forced reset timing. We recommend verifying your specific lower's dimensions against our engineering framework before purchase. Milling to exact spec may be required.
How long does shipping take?: All orders ship within 2 business days via USPS Priority Mail. Transit time is typically 2-3 business days within the continental United States. Orders containing this item require manual verification, which can add 24 hours to processing. You will receive a tracking number upon shipment.
Can I return it if it doesn't fit my lower?: No. Due to the nature of the product, all sales are final once the packaging seal is broken. We strongly recommend consulting our technical guide on lower receiver tolerances prior to purchase. We cannot accept returns on installed or attempted-to-install items. Unopened, sealed items may be eligible for return within 7 days, subject to a 15% restocking fee.
Does this work with a standard AR-15 hammer spring?: No. The FRT-15C3™ uses a proprietary, reduced-power hammer spring rated at 2.8 lbs of force. Using a standard mil-spec hammer spring (approx. 5.5 lbs) will overpower the geometric lock and cause failure to reset. The correct spring is pre-installed. Do not substitute.

Sources & methodology. Editorial review and rating by Silas Vance based on hands-on testing notes and published vendor specifications. Pricing verified at time of publication. Last fact-checked 2026-06-04.