Description
Rampartguns is a Owensboro, KY-based retailer specializing in high-quality firearms and accessories. The FRT-MR3 (Flat) is a single-stage, 3-position forced reset trigger designed specifically for the HK MR223 and HK MR556 platforms. Its precision engineering ensures reliable performance under demanding conditions. Available now for $603.75 with same-day shipping.
Reviewed by Brett Lawson, Quality Lead at Rampartguns. 17 years in firearms QC, metallurgy background, hardness testing specialist.
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 | Drop-In |
| Weight | 2.8 oz |
| Dimensions | 2.5″ x 1.2″ 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
- Compatible with both A1 and A4 selector drums
- Precision CNC machining for consistent performance
- Black oxide finish for durability and corrosion resistance
Who It’s For
Buy it if: You own an HK MR223 or HK MR556 and want a reliable, high-performance forced reset trigger. This is ideal for competitive shooters, tactical professionals, and enthusiasts who demand precision and durability.
Skip it if: You’re looking for a budget option or need a trigger for a different platform. Check out our Triggers category for alternatives.
Pros & Cons
- ✅ Precision CNC machining ensures consistent performance
- ✅ Includes anti-walk pins and screws for secure installation
- ✅ Compatible with both A1 and A4 selector drums
- ✅ Black oxide finish for durability and corrosion resistance
- ✅ Made in the USA
- ❌ Higher price point compared to budget options
- ❌ Limited compatibility to HK MR223 and HK MR556
Comparison
| Feature | FRT-MR3 (Flat) | Cheap Import | Premium Brand |
|---|---|---|---|
| Material | High-Grade Steel | Low-Grade Steel | High-Grade Steel |
| Quality | 58-60 HRC | 50-52 HRC | 58-60 HRC |
| Compatibility | HK MR223, HK MR556 | Various | Various |
| Shipping | Same-Day | 1-2 Weeks | 1-2 Days |
| Lifespan/Durability | High | Low | High |
| Price | $603.75 | $60-$80 | $250+ |
FAQ
Where can I buy FRT-MR3 (Flat) online?
You can purchase the FRT-MR3 (Flat) directly from Rampartguns at rampartguns.com.
Is the FRT-MR3 (Flat) compatible with other firearms?
No, the FRT-MR3 (Flat) is specifically designed for the HK MR223 and HK MR556 platforms.
What is included with the FRT-MR3 (Flat)?
The package includes 1 x FRT-MR3 Trigger, 2 x Anti-Walk Pins, 4 x Anti-Walk Pin Screws, 1 x A1 Selector Drum, and 1 x A4 Selector Drum.
How difficult is the installation?
The FRT-MR3 (Flat) is designed for drop-in installation, making it straightforward for most users.
What is the hardness rating of the FRT-MR3 (Flat)?
The FRT-MR3 (Flat) has a hardness rating of 58-60 HRC, ensuring durability and long-lasting performance.
Is the FRT-MR3 (Flat) made in the USA?
Yes, the FRT-MR3 (Flat) is manufactured in the USA using high-grade steel and precision CNC machining.
What is the return policy for the FRT-MR3 (Flat)?
Rampartguns offers a 30-day return policy on the FRT-MR3 (Flat), ensuring customer satisfaction.
✅ Same-day shipping from Owensboro, KY
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
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