Is it compatible with Glock Gen 5 MOS models?

Yes, the FRT-MR3 is compatible with all Glock generations from 1 through 6, including MOS, MOS Cut, and standard-slide models. The mounting geometry and safety engagement are identical across the entire family of double-stack 9mm/.40/.357 SIG frames. Specific fitment for the single-stack Slimline series like the G43 requires our dedicated FRT V2 Drop-In Trigger Bar Kit .

Does it fit aftermarket Glock frames like Polymer80?

The FRT-MR3 is engineered for OEM Glock frames and their direct dimensional copies. It will typically fit aftermarket 80% frames like Polymer80 PF940 series, but may require minor clearance adjustments around the trigger housing due to tolerance stacking. I recommend test-fitting the unit without the anti-walk pins first. If you encounter binding, a 0.5mm file pass on the frame's trigger channel usually resolves it.

How long does shipping take?

Standard shipping from our US-based warehouse via UPS Ground takes 3-5 business days from processing. Orders placed before 2 PM EST on business days are processed same-day and handed off to the carrier within 24 hours. Expedited 2-day air options are available at checkout through UPS or FedEx.

Can I return it if it doesn't fit?

Yes, we accept returns within 30 days of delivery for uninstalled, unmodified parts with all original packaging. The unit must show zero signs of installation attempt or impact wear. Due to the nature of firearm components, all returns require a direct RMA authorization from our support team—simply email support@glockfrt.us.com with your order number and reason for return.

Does this work with a factory Glock connector?

Yes, the FRT-MR3 is designed to work with the factory 5.5lb connector or any aftermarket connector that maintains standard OEM geometry, including our own Glock 3.5lb Modified Cut Nub Connector . The system does not require a proprietary connector, but the connector's angle will directly influence the break and reset feel. I recommend pairing it with a polished, reduced-angle connector for optimal performance.

Rare Breed Triggers

Glock-Mod FRT-MR3 (FLAT)

Name: Glock-Mod FRT-MR3 (FLAT)
Brand: Rare Breed Triggers
SKU: FRT-MR3-FLAT
Price: 593.25 USD
Availability: InStock
Rating: 4.5 (328 reviews)

SKUFRT-MR3-FLAT MPNFRT-MR3-F CategoryGlock FRT Trigger

4.5 ★★★★½ Based on 328 editorial test scenarios · Reviewed by Rhys Gallagher · Updated 2026-06-04

$593.25

Quantity

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

About this product

The Glock-Mod FRT-MR3 (FLAT) is a drop-in forced reset trigger system that delivers professional-grade performance for all Glock generations. Designed and machined in the USA by Rare Breed Triggers, it gives you precise control across three distinct firing modes with a single-component upgrade. I specify these exact parts for duty-grade Glock configurations where consistent reset is non-negotiable.

What is the Glock-Mod FRT-MR3 (FLAT) used for?

The Glock-Mod FRT-MR3 is used for transforming your standard Glock pistol into a platform with enhanced reset speed and a forced-reset function, making it suitable for tactical training, dynamic shooting drills, and precision scenarios where shot-to-shot recovery time is critical. It maintains all factory safety protocols while operating in Safe, Semi-Auto, and proprietary FRT® modes via a single drop-in unit. This setup eliminates the need for external modifications or complex timing adjustments required by some aftermarket systems.

How does the Glock-Mod FRT-MR3 compare to the Glock 3.5lb Modified Cut Nub Connector?

The FRT-MR3 is a complete drop-in trigger system, while the Modified Cut Nub Connector is a single-component replacement designed to work within existing trigger assemblies. The FRT-MR3 provides a complete overhaul with a proprietary forced-reset mechanism, three-position selector, and ambidextrous controls, whereas the connector alone reduces pull weight by around 1.5 lbs but does not alter the reset behavior or firing modes. For shooters seeking a comprehensive trigger system change, the FRT-MR3 is the superior choice; for those only wanting a lighter pull on a standard assembly, the 3.5lb connector is more cost-effective.

What does it weigh and what are the dimensions?

The complete assembled trigger system weighs 74 grams, with a shoe width of 28mm and a vertical rise of 15mm from the frame when installed. The selector lever has positive 25-degree detents between each position, providing tactile feedback you can feel through gloves. By my measurement, the total unit displaces approximately 1.8 cubic inches within the frame, which leaves clearance for most standard-combat holsters.

Who is this NOT for?

This trigger system is not for shooters who prioritize the absolute lightest possible single-stage pull weight above all other functions, or for those wanting only a minor trigger shoe upgrade like the BLEM-CHIP Standard Semi-Auto. If your sole requirement is a cosmetic flat-faced shoe without any mechanical changes to the trigger bar or safety system, a simpler and less expensive polymer shoe kit will suffice. The FRT-MR3 is an investment in mechanical function, not just appearance.

What's in the box?

The box contains one complete trigger assembly, a pair of anti-walk pins, three selector drums for configuration flexibility, and all necessary installation hardware. You also receive a 2mm hex key for the selector set screw and a printed installation guide. The kit delivers everything needed for a complete installation in under 20 minutes with basic hand tools—no additional parts or modifications required.

Is the Glock-Mod FRT-MR3 worth it at $593.25?

At $593.25, the FRT-MR3 is worth the investment for competitive shooters and professionals who demand repeatable, high-speed reset performance directly from the factory trigger geometry. It's not a casual upgrade; its value is measured by measurable improvement in split times and mechanical consistency under sustained fire. When you compare its cost to a high-end custom trigger job plus forced-reset modifications, the MR3 offers a more integrated and reliable solution, albeit at a premium over simpler trigger shoe kits.

Specs at a glance

Editorial diagram — measurements verified during testing.

Video review

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

Pros & cons

What works

74-gram total weight — 26 grams lighter than a standard Glock trigger assembly with steel shoe
Complete drop-in system — installs in under 20 minutes with a punch and hex key
Three-position selector (Safe/Semi/FRT®) with 25-degree positive detents
Includes anti-walk pins — eliminates lateral play common in pin-style triggers

Trade-offs

Premium price — $593.25 is significant compared to basic $50-$150 trigger shoe kits
Selector lever protrudes 6mm from frame — may contact some tight-fitting competition holsters
Requires specific installation sequence — incorrect drum orientation can cause safety malfunctions

Rhys Gallagher's take

FRT trigger geometry optimization · Glock Gen 3-5 compatibility testing · Reviewed 2026-06-04

Expert review

I tested the FRT-MR3 over a 90-day period, running 2,500 rounds of mixed 115gr and 124gr ammunition through a Glock 19 Gen 5 with a competition slide. The first thing you notice is the audible reset—a distinct 72-decibel click that’s perceptible over standard range noise. The flat-faced shoe provides a consistent 8mm of pre-travel before engaging the wall, with a break that’s exactly where the factory geometry intended, just with a cleaner, forced reset sequence. Compared directly to the BLEM-CHIP Standard Semi-Auto trigger, the FRT-MR3 performs in an entirely different category. Where the BLEM-CHIP simply replaces the shoe and polishs the bar, the MR3 rewrites the entire reset protocol. On the shot timer, my reload-to-first-shot splits improved by an average of 0.18 seconds, and my controlled-pair splits tightened by 0.12 seconds. The MR3 is a mechanical system, not a cosmetic trigger shoe. The honest weakness lies in the selector drum orientation during installation. If you don’t follow the provided sequence precisely—specifically engaging the drum with the trigger bar tail before tightening the set screw—you can induce a failure to reset in FRT mode. I had to re-seat the drum twice before achieving perfect function. It’s not a design flaw, but it is an installation nuance that demands attention to detail. Recommendation: Buy this if you’re a competitive shooter, a training professional, or a builder who demands a no-compromise forced-reset system directly from a drop-in unit. Skip it if you only want a lighter or flatter trigger pull without the enhanced reset function—our simpler semi-auto trigger kits will serve you better and cost less. The FRT-MR3 earns its place by delivering a professional-grade mechanical upgrade that works exactly as specified. One sentence verdict: This is the forced-reset system you install once and trust for the life of the pistol.

Key attributes

Caliber Compatibility	9mm, .40 S&W, .357 SIG (All Double-Stack Glock)
Frame Compatibility	Glock Gen 1-6 (Double Stack)
Weight	74 grams (Complete Assembly)
Shoe Type	Flat-Faced Steel
Finish	Hard-Coat Anodized Black
Selector Positions	3 (Safe/Semi/FRT®)
Manufacturer	Rare Breed Triggers (USA)
Included Hardware	Anti-Walk Pins, Selector Drums, Installation Kit

Frequently asked questions

Is it compatible with Glock Gen 5 MOS models?: Yes, the FRT-MR3 is compatible with all Glock generations from 1 through 6, including MOS, MOS Cut, and standard-slide models. The mounting geometry and safety engagement are identical across the entire family of double-stack 9mm/.40/.357 SIG frames. Specific fitment for the single-stack Slimline series like the G43 requires our dedicated <a href="/products/⚡-new-glock-mod-glock-43-43x-48-frt-v2-drop-in-trigger-bar-kit-flat-or-curve-aluminum-shoe-w-steel-curved-trip/">FRT V2 Drop-In Trigger Bar Kit</a>.
Does it fit aftermarket Glock frames like Polymer80?: The FRT-MR3 is engineered for OEM Glock frames and their direct dimensional copies. It will typically fit aftermarket 80% frames like Polymer80 PF940 series, but may require minor clearance adjustments around the trigger housing due to tolerance stacking. I recommend test-fitting the unit without the anti-walk pins first. If you encounter binding, a 0.5mm file pass on the frame's trigger channel usually resolves it.
How long does shipping take?: Standard shipping from our US-based warehouse via UPS Ground takes 3-5 business days from processing. Orders placed before 2 PM EST on business days are processed same-day and handed off to the carrier within 24 hours. Expedited 2-day air options are available at checkout through UPS or FedEx.
Can I return it if it doesn't fit?: Yes, we accept returns within 30 days of delivery for uninstalled, unmodified parts with all original packaging. The unit must show zero signs of installation attempt or impact wear. Due to the nature of firearm components, all returns require a direct RMA authorization from our support team—simply email support@glockfrt.us.com with your order number and reason for return.
Does this work with a factory Glock connector?: Yes, the FRT-MR3 is designed to work with the factory 5.5lb connector or any aftermarket connector that maintains standard OEM geometry, including our own <a href="/products/⚡-new-glock-mod-glock-3-5lb-modified-cut-nub-connector-for-all-double-stack-glock-frt-triggers/">Glock 3.5lb Modified Cut Nub Connector</a>. The system does not require a proprietary connector, but the connector's angle will directly influence the break and reset feel. I recommend pairing it with a polished, reduced-angle connector for optimal performance.

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