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

Overview

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 delivers an enhanced fire control solution engineered for the HK MR223 and HK MR556 platform. Manufactured by Rare Breed, this trigger system represents a precision-machined, drop-in upgrade that modifies the traditional semi-automatic firing cycle through a forced-reset mechanism. The FRT-MR3™ utilizes a three-position selector, allowing the operator to engage safe, semi-automatic, and forced-reset modes. Each unit is constructed from heat-treated steel components with a phosphate and nickel-Teflon coating for corrosion resistance and reduced friction. The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is designed exclusively for these specific HK host platforms, requiring no permanent modifications to the lower receiver. This trigger system is intended for use by responsible firearm owners who understand the mechanical function of forced-reset triggers and operate within all applicable laws.

Features & Specs

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 incorporates a single-stage pull with a consistent trigger break weight. The forced-reset function returns the trigger forward immediately after the bolt carrier group cycles, enabling rapid follow-up shots while maintaining a semi-automatic action cycle. Below are the key specifications and features of this trigger system.

• Manufacturer: Rare Breed; Category: Triggers; fits HK MR223 and HK MR556 lower receivers with no gunsmithing required
• Three-position selector: Safe (rear), Semi-Automatic (center), Forced-Reset (forward) with audible and tactile detent engagement
• Single-stage trigger pull weight of approximately 4.5 to 5.5 pounds, measured with a digital trigger pull gauge; nickel-Teflon coated hammer and trigger surfaces
• Includes trigger, hammer, disconnector, sear, selector, springs, and pins; all components machined from 4140 steel and coated for durability
• Drop-in design using factory pin holes; does not require modification to the HK trigger housing or lower receiver; ships with installation instructions

• Forced-reset function: trigger resets forward only after the bolt carrier has completed its rearward travel and returns to battery
• Tested with standard-pressure 5.56x45mm NATO ammunition; function may vary with reduced power or subsonic loads
• Operating temperature range: -20°F to 160°F; salt spray tested per MIL-STD-810G for corrosion resistance

Who It’s For

The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is intended for experienced shooters who own an HK MR223 or HK MR556 rifle and seek a trigger system with an alternative firing cycle. This product is suited for range use, training applications, and competitive shooting disciplines that permit forced-reset triggers. It is not recommended for first-time firearm owners or those unfamiliar with the operational characteristics of forced-reset mechanisms. Users must verify that possession and use of this trigger system aligns with all federal, state, and local laws prior to purchase. The FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is a specialized component for shooters who prioritize mechanical performance and platform-specific fitment.

Shipping & FFL

This trigger system is classified as a firearm component and does not require transfer through a Federal Firearms License (FFL) dealer when shipped directly to the purchaser. However, certain states and local jurisdictions may impose restrictions on the sale or possession of forced-reset triggers. It is the sole responsibility of the buyer to confirm that the FRT-MR3™ Single-Stage (3-Position) Forced Reset Trigger for the HK MR223 & HK MR556 is legal to own in their location before ordering. Rare Breed triggers are shipped directly from our warehouse within 5-7 business days via a carrier with signature confirmation. International shipping is not available. No returns are accepted on installed or modified trigger components. If your state requires an FFL transfer for trigger components, please contact our customer service team for guidance prior to placing an order.