Tn Guns is a Raleigh, NC-based retailer specializing in high-performance firearms and accessories. The FRT-MR3 is a single-stage (3-position) forced reset trigger designed specifically for the HK MR223 and HK MR556 platforms. Engineered for precision and reliability, this trigger offers a unique shooting experience. Available now for $603.75 with same-day shipping.
Reviewed by Derrick Cole, Range Master & Reviewer at Tn Guns. 19 years competitive shooting, product tester for 3 manufacturers.
Last updated: May 2026
FRT-MR3 Specifications
| Product Type | Forced Reset Trigger |
|---|---|
| Material | High-grade steel |
| Manufacturing | CNC machined |
| Finish | Black oxide |
| Hardness/Quality | 58-60 HRC |
| Compatibility | HK MR223, HK MR556 |
| Installation/Usage | Drop-in with included anti-walk pins |
| Weight | 3.2 oz |
| Dimensions | 2.5″ x 1.2″ x 0.8″ |
| Country of Origin | USA |
| Condition | New |
| SKU | FRT-MR3 |
Key Features
- Single-stage forced reset for rapid, controlled fire
- 3-position selector with included A1 and A4 selector drums
- Anti-walk pins included for secure installation
- CNC-machined steel construction for durability
- Black oxide finish for corrosion resistance
Who It’s For
Buy it if:
- You own an HK MR223 or MR556 and want a high-performance trigger
- You’re a competitive shooter looking for rapid, controlled fire
- You value precision engineering and durability
Skip it if:
- You’re on a tight budget (check out our budget triggers)
- You don’t own an HK MR223 or MR556
Pros & Cons
Pros:
- ✅ Precision CNC machining for consistent performance
- ✅ Includes all necessary hardware for installation
- ✅ Durable black oxide finish
- ✅ 3-position selector for versatility
- ✅ Made in the USA
Cons:
- ❌ Higher price point than standard triggers
- ❌ Limited compatibility (HK MR223/MR556 only)
FRT-MR3 vs Competitors
| Feature | FRT-MR3 | Cheap Import | Premium Brand |
|---|---|---|---|
| Material | High-grade steel | Cast aluminum | Steel |
| Quality | CNC machined | Cast | CNC machined |
| Compatibility | HK MR223/MR556 | Generic AR-15 | Multiple platforms |
| Shipping | Same-day | 2-4 weeks | 1-2 weeks |
| Lifespan | 50,000+ rounds | 10,000 rounds | 50,000+ rounds |
| Price | $603.75 | $60-80 | $250+ |
FAQ
Where can I buy the FRT-MR3 online?
You can purchase the FRT-MR3 right here at Tn Guns (tn-guns.com) with same-day shipping from Raleigh, NC.
How does the FRT-MR3 compare to the FRT-15L3?
The FRT-MR3 is specifically designed for HK MR223 and MR556 platforms, while the FRT-15L3 is for standard AR-15s. The FRT-MR3 also includes additional selector drums for compatibility with HK firearms.
Is the FRT-MR3 legal?
As of May 2026, the FRT-MR3 is legal for purchase and use in most states. However, laws can change, so we recommend checking your local regulations.
What’s included with the FRT-MR3?
The FRT-MR3 comes with the trigger, 2 anti-walk pins, 4 anti-walk pin screws, 1 A1 selector drum, and 1 A4 selector drum.
How difficult is installation?
Installation is straightforward with basic gunsmithing skills. The included anti-walk pins make it more secure than standard trigger pins.
What’s the trigger pull weight?
The FRT-MR3 has a consistent pull weight of approximately 4.5 lbs.
Does it work with all HK MR223/MR556 models?
Yes, the FRT-MR3 is compatible with all HK MR223 and MR556 variants.
✅ Same-day shipping from Raleigh, NC
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: Triggers | Full Shop
About this review: This assessment is based on hands-on testing by Derrick Cole, Range Master & Reviewer at Tn Guns, with 19 years of competitive shooting experience and product testing for 3 manufacturers.
Last updated: May 2026
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