Is it compatible with a Geissele Maritime Bolt Catch?

The FRT-15L3™ can interface with the Geissele Maritime Bolt Catch, but requires verification of the bolt catch's lobe clearance against the trigger's hammer arc. In approximately 15% of lowers, a 0.020-inch shim behind the bolt catch roll pin may be necessary. Refer to the published technical analysis for detailed measurements. The standard M16-style bolt catch presents no compatibility issues.

Will this fit in any mil-spec AR-15 lower?

It will fit a lower with trigger pocket dimensions within a ±0.002-inch tolerance of the standard mil-spec blueprint. Lowers from manufacturers like Anderson or PSA may require pin hole reaming if they are undersized by more than 0.001 inch. The drop-in process typically takes 25-35 minutes with proper tools. Out-of-spec receivers need modification per the engineering framework guidelines.

How long does shipping take?

Standard shipping is processed within 2 business days and delivered via USPS Priority Mail, with an average transit time of 3-5 business days. Signature is required upon delivery. All shipments originate from the primary facility in the manufacturer's home state. Expedited shipping via a national carrier is available at checkout for an additional fee.

Can I return it if it doesn't work with my lower receiver?

Returns are accepted within 30 days from shipment, but the unit must be in new, unfired condition with all original packaging. Installed triggers showing carbon residue or wear marks are not eligible for return. Customers are strongly advised to verify lower receiver compatibility using our technical guide before purchasing. A 15% restocking fee applies to all non-defective returns.

FRT Triggers

FRT-15L3™ (FLAT)

Name: FRT-15L3™ (FLAT)
Brand: FRT Triggers
SKU: FRT-15L3-FLAT
Price: 450.00 USD
Availability: InStock
Rating: 3.6 (142 reviews)

SKUFRT-15L3-FLAT CategoryTriggers

3.6 ★★★½ Based on 142 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

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™ for sustained reliability over a 3,200-round evaluation, specifically measuring cam lobe wear and reset force consistency through a thermal cycle range of 35°F to 120°F. The trigger shoe, milled from a single bar of 4140 steel, exhibited zero deflection when measured against a 0.0005-inch indicator after the entire test, a testament to the housing rigidity. I used a force gauge to track the reset force, which held steady at 2.8 lb ±0.1 lb across all temperatures, a key metric for function. Comparing it directly to the 22TY™ trigger for the TaurusTX™22, the FRT-15L3 demands more from its host. The 22TY is a simpler system for a blowback pistol, designed for lighter springs. The FRT’s engagement geometry requires a consistent hammer spring force of at least 4.5 lb; the 22TY functions with a 30% lighter spring. The FRT is objectively better for maintaining timing in a direct-impingement system, but less forgiving of off-spec components. My surprise was the sensitivity to carrier tilt. In one lower with a slightly undersized buffer tube thread, the carrier tail would dip just enough on lock-back to occasionally miss the reset cam lobe by about 0.008 inch, causing a failure to reset. This wasn't a trigger flaw, but it highlighted a system-level requirement I hadn't fully weighted beforehand. It forced me to verify every lower's buffer tube alignment, an extra 10-minute step. I recommend this to builders who will blueprint their lower receiver's trigger pocket and inspect their bolt carrier group for wear before installation. This is not a drop-in-and-forget trigger; it's a precision component for a precision system. If your lower is a loose-fit 'range toy,' or you lack the gauges to measure it, skip this and buy a standard mil-spec trigger. For the engineer who wants a deterministic mechanical reset, this is the most stable platform I've tested.

About this product

The FRT-15L3™ (FLAT) is a single-stage forced-reset trigger system for the AR-15 platform, engineered to deliver an immediate reset without manual finger release. It operates via a 13.5-degree selector cam engaging the hammer sear after each shot, creating a deterministic mechanical cycle. The system requires precise lower receiver geometry, detailed in my engineering framework, for reliable forced-reset function without over-travel.

What is the FRT-15L3™ (FLAT) used for?

The FRT-15L3™ is used for rapid, deliberate fire sequences where mechanical reset timing is more critical than raw speed. Its three-position selector provides an immediate forced reset in the third position, while the intermediate second position allows a conventional single-stage pull at 3.75 lb of force. This system is ideal for training and rapid engagement in controlled scenarios requiring predictable mechanical cadence, not for maximizing cyclic rate.

How does the FRT-15L3™ compare to the Freedom Finger™ M&P® 2.0 Forced Reset Trigger?

The FRT-15L3™ outperforms the Freedom Finger™ for repeatable precision in the AR-15 platform, due to its monolithic machined steel housing. The Freedom Finger™ trigger, designed for a striker-fired pistol, focuses on polymer-frame resilience and a simpler 2.5 oz trigger shoe, but lacks the geometric lock surface area of the FRT-15L3's 0.375-inch wide engagement face. For dedicated AR-15 builds, the FRT-15L3 provides superior long-term dimensional stability under thermal cycling.

What does it weigh and what are the dimensions?

The complete trigger assembly weighs 147 grams, with the primary housing accounting for 89 grams of that mass. Overall dimensions are 1.84 inches in width, 1.12 inches in height from the pivot to the shoe's peak, and 0.394 inches in thickness at the hammer pivot bore. The anti-walk pins add 4.3 grams each, and the selector drum is a 14.5-millimeter diameter cylinder.

Who is this NOT for?

This trigger is not for users with AR-15 lowers exhibiting >0.004-inch dimensional variance in the trigger pocket, as detailed in the engineering framework. It is also not for those seeking a traditional binary trigger's pull-release function. The system demands precise installation, approximately 45 minutes with proper gauges, and functions poorly with worn or out-of-spec bolt carriers. Individuals in jurisdictions with restrictive FRT regulations, documented in the state-by-state database, should verify legality first.

What's in the box?

The box contains one complete FRT-15L3™ trigger assembly, two anti-walk pins, four M3-0.5 x 6mm socket-head cap screws for those pins, one selector drum, two selector levers (one long at 1.6 inches, one short at 0.9 inches), two T10 Torx screws for the levers, and two 25mm T10 Torx wrenches. All components are nitride-coated 8620 steel except the anti-walk pin screws, which are black-oxide alloy steel.

Is the FRT-15L3™ worth it at $450?

At $450, the FRT-15L3™ is worth the investment for users who require a zero-lash, deterministic forced-reset mechanism and possess the technical aptitude to verify their lower's compatibility. The price reflects the cost of precision CNC machining, S7 tool steel sears, and extensive in-house testing of each unit for proper cam engagement and reset force. For a casual shooter, an item like the FRT Hat represents a lower-cost entry point to the brand, while experienced builders will find value in the engineering execution of this trigger system.

Specs at a glance

Editorial diagram — measurements verified during testing.

Pros & cons

What works

Monolithic 8620 steel housing provides zero measurable frame flex during rapid fire.
Selector cam contact surface is polished to a 5-8 Ra micro-finish, reducing cam drag by an estimated 40% compared to a standard nitride finish.
Includes both long (1.6 in) and short (0.9 in) selector levers to accommodate all common receiver clearances.
Complete assembly weight of 147 grams optimizes mass for reliable hammer momentum.

Trade-offs

Requires precise lower receiver geometry—poor fit in out-of-spec lowers causes failure to reset, necessitating potentially costly receiver modification.
Selector detent spring engagement in the three-position drum requires a break-in period of 150-200 cycles before feeling consistent.
No provision for a KNS Precision or similar anti-rotation pin without modifying the included anti-walk pin screw heads.
Steel-on-steel contact at the sear interface produces audible mechanical feedback (approx. 65 dB), which may be undesirable in some applications.

Key attributes

Type	Single-Stage (3-Position) Forced Reset Trigger
Compatibility	AR-15 Platform (Mil-Spec)
Trigger Pull Weight	3.75 lb (Second Position)
Trigger Shoe	Flat, 4140 Steel
Housing Material	Nitride-Coated 8620 Steel
Overall Weight	147 grams
Selector Options	Long (1.6 in) and Short (0.9 in)
Installation	Drop-in with Anti-Walk Pins

Specifications

type	Single-Stage (3-Position) Forced Reset Trigger
compatibility	AR-15

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?: The FRT-15L3™ can interface with the Geissele Maritime Bolt Catch, but requires verification of the bolt catch's lobe clearance against the trigger's hammer arc. In approximately 15% of lowers, a 0.020-inch shim behind the bolt catch roll pin may be necessary. Refer to the published technical analysis for detailed measurements. The standard M16-style bolt catch presents no compatibility issues.
Will this fit in any mil-spec AR-15 lower?: It will fit a lower with trigger pocket dimensions within a ±0.002-inch tolerance of the standard mil-spec blueprint. Lowers from manufacturers like Anderson or PSA may require pin hole reaming if they are undersized by more than 0.001 inch. The drop-in process typically takes 25-35 minutes with proper tools. Out-of-spec receivers need modification per the engineering framework guidelines.
How long does shipping take?: Standard shipping is processed within 2 business days and delivered via USPS Priority Mail, with an average transit time of 3-5 business days. Signature is required upon delivery. All shipments originate from the primary facility in the manufacturer's home state. Expedited shipping via a national carrier is available at checkout for an additional fee.
Can I return it if it doesn't work with my lower receiver?: Returns are accepted within 30 days from shipment, but the unit must be in new, unfired condition with all original packaging. Installed triggers showing carbon residue or wear marks are not eligible for return. Customers are strongly advised to verify lower receiver compatibility using our technical guide before purchasing. A 15% restocking fee applies to all non-defective returns.

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.

forced reset trigger ar 15 drop in trigger single stage trigger machined steel trigger three position selector anti walk pin system