Polymer80Central is a Logan, UT-based retailer specializing in high-performance firearms components. The FRT-MR3 (Flat) is a single-stage, 3-position forced reset trigger designed specifically for the HK MR223 and HK MR556 platforms. This precision-engineered trigger offers unmatched reliability and performance. Available now for $603.75.
Reviewed by Cody Ramirez, E-Commerce Director at Polymer80Central. 11 years building firearms retail platforms, SEO and conversion specialist.
Last updated: May 2026
FRT-MR3 (Flat) Specifications
| Product Type | Forced Reset Trigger |
|---|---|
| Material | High-Grade Steel |
| Manufacturing | CNC Machined |
| Finish | Black Oxide |
| Hardness/Quality | Rockwell C58 |
| Compatibility | HK MR223, HK MR556 |
| Installation/Usage | Professional Installation Recommended |
| Weight | 3.2 oz |
| Dimensions | 2.75″ x 1.25″ x 0.5″ |
| Country of Origin | USA |
| Condition | New |
| SKU | FRT-MR3-FLAT |
Key Features
- Single-stage, 3-position forced reset mechanism
- Includes anti-walk pins and screws for secure installation
- Comes with both A1 and A4 selector drums
- CNC machined from high-grade steel
- Black oxide finish for durability and corrosion resistance
Who Should Buy the FRT-MR3 (Flat)?
Buy it if: You own an HK MR223 or HK MR556 and want a reliable, high-performance forced reset trigger.
Skip it if: You’re looking for a budget option or need compatibility with other platforms. For alternatives, check out our Triggers category.
Pros & Cons
- ✅ Precision CNC machining ensures consistent performance
- ✅ Includes all necessary components for installation
- ✅ Compatible with both HK MR223 and HK MR556
- ✅ Durable black oxide finish
- ✅ Made in the USA
- ❌ Higher price point compared to some alternatives
- ❌ Requires professional installation
Comparison
| Feature | FRT-MR3 (Flat) | Competitor A | Competitor B |
|---|---|---|---|
| Material | High-Grade Steel | Aluminum | Steel |
| Quality | CNC Machined | Cast | CNC Machined |
| Compatibility | HK MR223, HK MR556 | Multiple Platforms | HK MR223, HK MR556 |
| Shipping | Same-Day | 3-5 Days | 1-2 Days |
| Lifespan/Durability | 10,000+ Rounds | 5,000 Rounds | 8,000 Rounds |
| Price | $603.75 | $250 | $450 |
Video Review
FAQ
Where can I buy FRT-MR3 (Flat) online?
You can purchase the FRT-MR3 (Flat) at Polymer80Central.
Is the FRT-MR3 (Flat) compatible with other platforms?
No, it is specifically designed for HK MR223 and HK MR556 platforms.
What is included in the package?
The package includes 1 FRT-MR3 Trigger, 2 Anti-Walk Pins, 4 Anti-Walk Pin Screws, 1 A1 Selector Drum, and 1 A4 Selector Drum.
How durable is the FRT-MR3 (Flat)?
The FRT-MR3 (Flat) is designed to withstand over 10,000 rounds of use.
Is professional installation required?
Yes, professional installation is recommended to ensure proper function and safety.
What is the return policy?
Polymer80Central offers a 30-day return policy on the FRT-MR3 (Flat).
Where is the FRT-MR3 (Flat) manufactured?
The FRT-MR3 (Flat) is manufactured in the USA.
✅ In stock — ready to ship today
✅ Same-day shipping from Logan, UT
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: Triggers | Full Shop
About this review + “Last updated: May 2026”
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