FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556

The FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a dedicated drop-in assembly engineered by Rare Breed to match the exact dimensions and bolt carrier geometry of the HK MR223 and MR556 platforms. This trigger utilizes a forced-reset mechanism that returns the trigger shoe forward immediately after the hammer falls, resetting the sear without requiring a full manual release from the shooter. The result is a repeatable, consistent trigger pull that aligns with the operating cycle of the rifle. Designed for shooters who demand precise shot-to-shot timing, the FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 offers three selectable positions: Safe, Semi-Automatic, and Forced Reset. Each position is clearly marked and mechanically distinct, ensuring unambiguous selector operation. The flat trigger shoe provides a consistent finger placement point, reducing pull variation during rapid engagement sequences. This is not a binary trigger or a full-auto conversion device. It is a purpose-built trigger system that functions within the mechanical limits of the host firearm when properly installed.

Overview

The FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a factory-direct replacement for the standard trigger group found in HK-pattern rifles chambered in .223 Remington or 5.56 NATO. Rare Breed has engineered this unit to interface directly with the HK MR223 and MR556 lower receivers without modification to the firearm. The forced-reset function operates by utilizing the forward momentum of the bolt carrier to mechanically push the trigger shoe forward after each shot, resetting the trigger for the next cycle. This design allows the shooter to maintain consistent trigger control through the entire firing sequence. The trigger housing is CNC-machined from 7075-T6 aluminum, and all internal components are constructed from hardened steel with a corrosion-resistant finish. The flat trigger shoe reduces over-travel and provides a consistent, repeatable pad position. This unit is a single-stage design with a factory-set pull weight of approximately 4.5 to 5.5 pounds, depending on the selector position used.

Features & Specs

• Three-position selector: Safe, Semi-Automatic, and Forced Reset positions are mechanically distinct and clearly labeled for immediate visual confirmation of fire mode. The forced-reset position enables the unique cycling mechanism of the FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556.
• Flat single-stage trigger shoe: Provides a consistent, non-slip finger interface that reduces lateral movement during rapid fire. The flat profile allows for more consistent trigger placement compared to curved shoes, which can vary with finger position.
• Drop-in design: No fitting, drilling, or permanent modification to the HK MR223 or MR556 lower receiver is required. The assembly uses factory pin locations and includes all necessary hardware for direct installation. The hammer, disconnector, and sear are pre-assembled into a single cassette.

Additional specifications include a nickel-Teflon coated hammer and sear for reduced friction and long-term corrosion resistance. The trigger housing is identical in width to the factory trigger pocket, preventing side-to-side play. The unit is compatible with standard HK MR223 and MR556 safety selectors and does not require aftermarket selector modifications. The FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is covered by Rare Breed’s limited lifetime warranty against defects in materials or workmanship. The trigger is manufactured in the United States.

Who It Is For

This trigger is intended for the experienced HK MR223 or MR556 owner who understands the operational characteristics of forced-reset trigger systems. It is suitable for shooters who train for speed and precision and who want a repeatable, mechanical advantage in shot-to-shot recovery. The FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is not recommended for beginner shooters or for those unfamiliar with the reset mechanics of forced-reset systems. It is designed for range use, competitive shooting, and training environments where the shooter maintains full control of the firearm at all times. This product is not a substitute for automatic fire and should only be used in accordance with all applicable federal, state, and local laws. The shooter must verify legality of forced-reset triggers in their jurisdiction before purchase or installation. Rare Breed recommends professional installation by a qualified gunsmith if the user is not familiar with AR-platform trigger replacement.

Shipping & FFL

This product ships directly to your address. No Federal Firearms License (FFL) transfer is required because the FRT-MR3™ (Flat) Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a firearm component, not a serialized receiver or complete firearm. However, it is the sole responsibility of the purchaser to ensure that ownership and installation of this trigger is legal in their state, county, and municipality. Some jurisdictions restrict or prohibit forced-reset triggers. By purchasing this item, you confirm that you are in compliance with all applicable laws. Rare Breed and the retailer disclaim all liability for misuse or illegal possession. Standard shipping rates apply. Orders are processed within 1 to 3 business days. No expedited shipping options are available for this item due to regulatory compliance requirements. If you have questions regarding local legality, contact your local law enforcement or a licensed firearms attorney before ordering.