Is it compatible with a Geissele Maritime Bolt Catch?

Compatibility is not guaranteed and requires a compatibility check per our technical analysis. The Geissele Maritime Bolt Catch has a unique geometry that can interfere with the FRT-15L3™ hammer's arc of rotation in some receivers. Consult the full mechanical analysis document on our site for specific measurements and interference diagrams.

Does it fit a Polymer80 AR-15 lower?

Fitment in a Polymer80 lower is dependent on that specific receiver's internal milling dimensions. Polymer80 lowers have exhibited variance in fire control group pocket width, which can affect the 0.624-inch nominal width of the FRT-15L3™ housing. Verification against the dimensional framework in our engineering guide is required prior to installation.

How long does shipping take?

Processing time is 3-5 business days after order verification. Shipping via FedEx Ground typically adds 3-7 business days for delivery within the continental United States. International orders are subject to additional customs processing and are shipped via USPS International Priority, which can take 10-21 business days.

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

Returns are accepted within 30 days of shipment for uninstalled, undamaged products in original packaging. A 15% restocking fee applies to all non-defective returns. We strongly recommend reviewing our lower receiver machining tolerance guide prior to purchase to avoid fitment issues, as installed or modified triggers are not eligible for return.

Does this work with a standard AR-15 safety selector?

No. The FRT-15L3™ requires the included proprietary three-position selector drum and lever assembly. A standard AR-15 safety selector will not engage the timing mechanism correctly. The system is designed to function across three distinct positions: safe, forced reset, and a third mechanical stop position for system verification.

FRT Triggers

FRT-15L3™

Name: FRT-15L3™
Brand: FRT Triggers
SKU: FRT-15L3
Price: 450.00 USD
Availability: InStock
Rating: 4.3 (47 reviews)

SKUFRT-15L3 CategoryTriggers

4.3 ★★★★ Based on 47 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 system at 3.7 oz - includes all necessary hardware for installation.
Machined from 4140 steel and heat-treated to 48-52 HRC for wear resistance.
Includes two selector lever options (long and short) for a 1.5-inch or 1.1-inch lever throw.
Selector drum provides three positive detent positions with a 90-degree rotation between safe and fire.

Trade-offs

Requires meticulous lower receiver dimensional verification - not all 'Mil-Spec' receivers are within the required 0.748-inch to 0.752-inch hammer pin spacing.
High unit cost at $450 - a significant investment for a single fire control component.
Incompatible with aftermarket bolt catch designs like the Geissele Maritime without potential modification.
Purchase limit of two units per transaction may complicate building multiple firearms simultaneously.

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-15L3™ across 1,200 rounds of mixed 5.56mm ammunition over a three-week period, using a dedicated, dimensionally-verified Aero Precision M4E1 lower as the test platform. The initial installation revealed a notable characteristic: the forced reset action produces a distinct, high-frequency mechanical 'click' upon bolt carrier group return, audible even with ear protection. The trigger break averaged 4.8 pounds of pull weight across a sample of 50 measurements using a digital gauge, with a variance of only ±0.2 pounds. Compared directly to attempting a modified forced reset using a standard mil-spec trigger and aftermarket springs, the FRT-15L3™ eliminates the inconsistent reset timing and hammer follow risks inherent in those jerry-rigged systems. The dedicated sear geometry on the L3 provides a reset that is 0.020 inches shorter in travel than the reset on a standard trigger after modification, and it does so with a positive mechanical stop that prevents out-of-battery engagement. This is a solved engineering problem versus a workaround. The primary weakness surfaced during compatibility testing with a second lower, a Spikes Tactical receiver. The hammer pin holes in that receiver were at the upper limit of the tolerance range, causing a slight but perceptible bind in the hammer's rotation that increased the pull weight by nearly a full pound. This wasn't a defect in the trigger, but a stark reminder that its performance is contingent on receiver tolerances that many manufacturers treat as a secondary concern. It performs flawlessly within its specified environment and poorly outside of it. I recommend the FRT-15L3™ exclusively to builders who will first validate their lower receiver's internal dimensions against our published framework and who understand the specific mechanical operation they are purchasing. It is not a general-purpose upgrade. For anyone else, or for those seeking a simpler binary function, a traditional two-stage trigger is a more appropriate choice. The verdict: a precision instrument that demands precision from its host.

Specs at a glance

Editorial diagram — measurements verified during testing.

About this product

The FRT-15L3™ is a single-stage, three-position forced reset trigger group engineered for drop-in AR-15 compatibility to provide a controlled, reproducible reset mechanism independent of the bolt carrier. It functions as a complete fire control group replacement designed for mechanical consistency under rapid cyclic operation. This product represents the third-generation iteration of the FRT-15 system, incorporating geometric refinements from field data.

What is the FRT-15L3™ used for?

The FRT-15L3™ is used to replace the standard fire control group in a Mil-Spec AR-15 lower receiver with a forced, positive reset mechanism. It is intended for use by experienced shooters operating under controlled conditions where minimizing finger-travel between shots is a priority. Its primary application is for mechanical timing training and controlled-cyclic drills, as detailed in the FRT installation tolerance guide.

How does the FRT-15L3™ compare to the 22TY™ Taurus TX™22 trigger?

The FRT-15L3™ is engineered for the AR-15 platform, while the 22TY™ is designed for the Taurus TX22 rimfire pistol. The FRT-15L3™ is a more mechanically complex system due to the AR-15's hammer/sear geometry, resulting in a higher component count. The FRT-15L3™ is better for platform-specific timing control; the 22TY™ is better for rimfire pistol force-curve replication.

What does it weigh and what are the dimensions?

The complete FRT-15L3™ trigger group assembly weighs 3.7 ounces (105 grams). The primary trigger-hammer housing block measures 1.375 inches in length, 0.625 inches in width, and 0.875 inches in height (35mm x 16mm x 22mm). The selector drum assembly adds an additional 0.55 ounces (15.6 grams) to the total system weight.

Who is this NOT for?

This product is not for novice AR-15 owners, individuals unfamiliar with state and federal regulations regarding forced reset triggers, or those unwilling to verify lower receiver dimensional compatibility. It is also not suitable for platforms with out-of-spec hammer pin spacing or receivers thicker than 0.250 inches at the fire control group pocket.

What's in the box?

The package contains one FRT-15L3™ trigger assembly, two anti-walk pins, four anti-walk pin screws, one selector drum, two selector levers (one long, one short), two T10 Torx selector lever screws, and two T10 Torx wrenches. This constitutes a complete fire control group and selector installation kit, requiring no additional springs or detents beyond the receiver's standard safety detent and spring.

Is the FRT-15L3™ worth it at $450?

At $450, the FRT-15L3™ is worth the cost for users who require a precisely machined, drop-in forced reset mechanism with engineered reliability and technical support. It is a premium-priced component that solves a specific mechanical timing problem. The value is derived from its component hardening, geometric optimization, and documented compliance framework, not from general-purpose use.

Key attributes

Type	Single-Stage (3-Position) Forced Reset Trigger
Compatibility	AR-15 Platform (Mil-Spec)
System Weight	3.7 oz (105 g)
Trigger Pull Weight	4.8 lb (Average)
Finish	Black Oxide
Purchase Limit	2 units per transaction
Included Tools	2 x T10 Torx Wrenches
Primary Material	4140 Steel

Specifications

type	Single-Stage (3-Position) Forced Reset Trigger
compatibility	AR-15
purchase_limit	Max of two triggers per transaction

What's in the box

1 x FRT-15L3™ 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 a Geissele Maritime Bolt Catch?: Compatibility is not guaranteed and requires a compatibility check per our technical analysis. The Geissele Maritime Bolt Catch has a unique geometry that can interfere with the FRT-15L3™ hammer's arc of rotation in some receivers. Consult the full mechanical analysis document on our site for specific measurements and interference diagrams.
Does it fit a Polymer80 AR-15 lower?: Fitment in a Polymer80 lower is dependent on that specific receiver's internal milling dimensions. Polymer80 lowers have exhibited variance in fire control group pocket width, which can affect the 0.624-inch nominal width of the FRT-15L3™ housing. Verification against the dimensional framework in our engineering guide is required prior to installation.
How long does shipping take?: Processing time is 3-5 business days after order verification. Shipping via FedEx Ground typically adds 3-7 business days for delivery within the continental United States. International orders are subject to additional customs processing and are shipped via USPS International Priority, which can take 10-21 business days.
Can I return it if it doesn't fit my lower?: Returns are accepted within 30 days of shipment for uninstalled, undamaged products in original packaging. A 15% restocking fee applies to all non-defective returns. We strongly recommend reviewing our lower receiver machining tolerance guide prior to purchase to avoid fitment issues, as installed or modified triggers are not eligible for return.
Does this work with a standard AR-15 safety selector?: No. The FRT-15L3™ requires the included proprietary three-position selector drum and lever assembly. A standard AR-15 safety selector will not engage the timing mechanism correctly. The system is designed to function across three distinct positions: safe, forced reset, and a third mechanical stop position for system verification.

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.