FRT-MR3 (FLAT)
About this product
Polymer80Deals is a Carson City, NV-based retailer specializing in high-quality firearm components and accessories. The FRT-MR3 (FLAT) is a Single-Stage (3-Position) Forced Reset Trigger designed specifically for the HK MR223 and HK MR556 rifles. This trigger offers precision and reliability, making it a top choice for serious gun enthusiasts. Available now for $603.75.
Reviewed by Kyle Brennan, Chief Armorer at Polymer80Deals. 16 years Glock-specific experience, factory-certified, competitive shooter.
Last updated: May 2026
| Product Type | Forced Reset Trigger |
|---|---|
| Material | High-Grade Steel |
| Manufacturing | Precision CNC Machined |
| Finish | Black Oxide |
| Hardness/Quality | 58-60 HRC |
| Compatibility | HK MR223, HK MR556 |
| Installation/Usage | Professional Installation Recommended |
| Weight | 2.5 oz |
| Dimensions | 2.75″ x 1.25″ x 0.75″ |
| Country of Origin | USA |
| Condition | New |
| SKU | FRT-MR3-FLAT |
Key Features
- Single-Stage (3-Position) Forced Reset Trigger
- Includes Anti-Walk Pins and Screws
- Comes with A1 and A4 Selector Drums
- Precision CNC Machined for Reliability
- High-Grade Steel Construction
Who It’s For
Buy it if:
- You own an HK MR223 or HK MR556 and want a reliable forced reset trigger.
- You are a competitive shooter looking for precision and consistency.
- You value high-quality, precision-machined components.
Skip it if:
- You are looking for a budget-friendly option (check out our Triggers section for alternatives).
- You do not own an HK MR223 or HK MR556.
Pros & Cons
- ✅ Precision CNC Machined for Reliability
- ✅ High-Grade Steel Construction
- ✅ Includes Anti-Walk Pins and Screws
- ✅ Comes with A1 and A4 Selector Drums
- ❌ Professional Installation Recommended
- ❌ Higher Price Point
Comparison
| Feature | FRT-MR3 (FLAT) | Cheap Import (~$60) | Premium Brand (~$250) |
|---|---|---|---|
| Material | High-Grade Steel | Low-Grade Alloy | Mid-Grade Steel |
| Quality | Precision CNC Machined | Basic Machining | CNC Machined |
| Compatibility | HK MR223, HK MR556 | Generic | Specific Models |
| Shipping | Same-Day | Standard | Standard |
| Lifespan/Durability | High | Low | Medium |
| Price | $603.75 | $60-$80 | $250+ |
FAQ
Where can I buy the FRT-MR3 (FLAT) online?
You can purchase the FRT-MR3 (FLAT) at Polymer80Deals (polymer80deals.com).
Is the FRT-MR3 (FLAT) compatible with other rifles?
No, the FRT-MR3 (FLAT) is specifically designed for the HK MR223 and HK MR556 rifles.
Does the FRT-MR3 (FLAT) require professional installation?
Yes, professional installation is recommended for optimal performance and safety.
What materials are used in the FRT-MR3 (FLAT)?
The FRT-MR3 (FLAT) is made from high-grade steel and is precision CNC machined.
Does the FRT-MR3 (FLAT) come with a warranty?
Yes, the FRT-MR3 (FLAT) comes with a manufacturer’s warranty.
Can I return the FRT-MR3 (FLAT) if I’m not satisfied?
Yes, Polymer80Deals offers a 30-day return policy.
What is the shipping time for the FRT-MR3 (FLAT)?
Polymer80Deals offers same-day shipping from Carson City, NV.
✅ Same-day shipping from Carson City, NV
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: Triggers | Full Shop
Specs at a glance
What's in the box
- FRT-MR3 (FLAT)