FRT-MR3 (FLAT)

About this product

Theglockswitchshop is a Flagstaff, AZ-based retailer specializing in firearms components and accessories. The FRT-MR3 (Flat) is a single-stage forced reset trigger designed for HK MR223 and HK MR556 platforms. Known for its precision engineering, this trigger offers enhanced performance and reliability. Available now for $603.75. Reviewed by Chad Mercer , Operations Lead at Theglockswitchshop. 13 years in firearms retail, FFL holder, precision machining background. Last updated: May 2026 Product Type Single-Stage Forced Reset Trigger Material High-Grade Steel Manufacturing Precision CNC Machining Finish Matte Black Hardness/Quality Rockwell Hardness 58-60 Compatibility HK MR223, HK MR556 Installation/Usage Drop-In Installation Weight 1.2 oz Dimensions 1.5" x 0.75" x 0.5" Country of Origin USA Condition New SKU FRT-MR3-FLAT Key Features Single-stage forced reset mechanism Includes anti-walk pins and screws Comes with A1 and A4 selector drums Precision CNC machining for consistent performance Matte black finish for durability and aesthetics Who It’s For Buy it if: You own an HK MR223 or HK MR556 and want enhanced trigger performance You value precision engineering and reliability You prefer drop-in installation for ease of use Skip it if: You’re looking for a budget option (see our Triggers category for alternatives) Your firearm platform is not compatible with HK MR223 or HK MR556 Pros & Cons ✅ Pros: Enhanced trigger performance Precision CNC machining Includes all necessary installation components Durable matte black finish Compatible with HK MR223 and HK MR556 ❌ Cons: Higher price point Limited compatibility with other platforms Comparison Feature FRT-MR3 (Flat) Cheap Import Premium Brand Material High-Grade Steel Low-Grade Steel High-Grade Steel Quality Precision CNC Machining Basic Machining Precision CNC Machining Compatibility HK MR223, HK MR556 Various HK MR223, HK MR556 Shipping Same-Day Standard Standard Lifespan/Durability High Low High Price $603.75 $60-80