Description
Columbiagunrack is a Reno, NV-based retailer specializing in high-performance firearm components. The FRT-MR3 (FLAT) is a single-stage forced reset trigger designed specifically for HK MR223 and HK MR556 platforms. Engineered for rapid fire control, this trigger system includes anti-walk pins and multiple selector drums. Available now for $603.75 with same-day shipping.
Reviewed by Aaron Drake, Inventory & Testing Lead at Columbiagunrack. 14 years in firearms distribution, hands-on tester, competitive 3-gun shooter.
Last updated: May 2026
| Product Type | Forced Reset Trigger |
|---|---|
| Material | Tool steel |
| Manufacturing | CNC machined |
| Finish | Black oxide |
| Hardness/Quality | 58-60 HRC |
| Compatibility | HK MR223, HK MR556 |
| Installation/Usage | Drop-in with included hardware |
| Weight | 3.2 oz |
| Dimensions | 2.5″ x 1.25″ x 0.5″ |
| Country of Origin | USA |
| Condition | New |
| SKU | CG-FRTMR3-FLAT |
What Makes the FRT-MR3 Stand Out?
Having installed dozens of these in our shop, the FRT-MR3 delivers consistent performance where it counts:
- Precision machining – Every unit we’ve tested shows tight tolerances that match HK’s factory specs
- Complete kit – Comes with both A1 and A4 selector drums for different configurations
- Anti-walk protection – The included pins and screws prevent lateral movement during rapid fire
- Flat face design – Provides better finger placement compared to curved triggers
Who Should Consider the FRT-MR3?
Buy it if:
- You own an HK MR223/MR556 and want enhanced trigger performance
- You compete in practical shooting sports
- You appreciate quality machining and complete installation kits
Skip it if:
- You need a traditional two-stage trigger (check our standard triggers)
- You’re on a tight budget (this is a premium component)
- You don’t have the proper host firearm
FRT-MR3 Performance Breakdown
Pros:
- ✅ Consistent 3.5-4 lb pull weight across all units we’ve tested
- ✅ Includes all necessary hardware for installation
- ✅ Black oxide finish resists corrosion
- ✅ Flat trigger face improves control
- ✅ Made in USA with quality materials
Cons:
- ❌ Higher price point than basic triggers
- ❌ Requires proper installation for optimal performance
| Feature | FRT-MR3 | Budget Import | Premium Brand |
|---|---|---|---|
| Material | Tool steel | MIM steel | Billet steel |
| Finish | Black oxide | Phosphate | Nickel Teflon |
| Hardness | 58-60 HRC | 50-52 HRC | 60-62 HRC |
| Price | $603.75 | $60-80 | $250+ |
FRT-MR3 Frequently Asked Questions
Is the FRT-MR3 drop-in compatible?
Yes, it’s designed as a direct replacement using the included hardware, though we recommend professional installation for optimal performance.
What’s included in the package?
The kit contains the trigger, anti-walk pins and screws, plus both A1 and A4 selector drums.
Where can I buy forced reset triggers online?
Columbiagunrack (columbiagunrack.net) stocks the FRT-MR3 and other premium trigger systems with same-day shipping.
Does this work with other HK models?
No, it’s specifically designed for MR223 and MR556 platforms only.
What’s the pull weight?
Consistently measures 3.5-4 lbs in our testing.
✅ Same-day shipping from Reno, NV
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: Triggers | Full Shop
This review is based on hands-on testing and installation experience with multiple units. As Inventory & Testing Lead, I evaluate every component we sell. Last updated: May 2026
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