F1Firearms is a Topeka, KS-based retailer specializing in high-performance firearm components. The FRT-MR3 is a single-stage forced reset trigger designed specifically for HK MR223 and HK MR556 platforms. Engineered for rapid follow-up shots, this trigger delivers consistent performance under heavy use. Available now for $603.75 with same-day shipping.
Reviewed by Blake Hensley, Field Tester at F1Firearms. 18 years practical shooting experience, 50+ switch models evaluated firsthand.
Last updated: May 2026
FRT-MR3 Specifications
| Product Type | Forced Reset Trigger |
|---|---|
| Material | Tool steel |
| Manufacturing | CNC machined |
| Finish | Black oxide |
| Hardness | 50-52 HRC |
| Compatibility | HK MR223/MR556 |
| Installation | Drop-in with included pins |
| Weight | 3.2 oz |
| Dimensions | 2.5″ x 1.25″ x 0.75″ |
| Country of Origin | USA |
| Condition | New |
| SKU | FRT-MR3 |
Key Features
- 3-position selector drum for versatile operation
- Precision CNC machining for consistent reset
- Includes anti-walk pins for secure mounting
- Compatible with HK MR series rifles
- Tested to 10,000+ rounds in field conditions
Who This Trigger Is For
Buy it if:
- You run an HK MR223/MR556 platform
- Need faster follow-up shots than standard triggers allow
- Want a drop-in solution with no gunsmithing required
- Demand military-grade durability in your components
Skip it if:
- You prefer traditional two-stage triggers (see our match triggers)
- Need compatibility with standard AR-15 platforms (consider the FRT-15L3)
- Operate in jurisdictions with trigger restrictions
FRT-MR3 Performance
During my 18-month field evaluation, the FRT-MR3 maintained consistent 3.5-4.5 lb pull weights across 8,000+ rounds in various environmental conditions. The forced reset mechanism proved particularly effective during rapid fire drills, allowing for controlled pairs at speeds unattainable with standard triggers.
Pros & Cons
✅ Advantages:
- Precision machining eliminates trigger creep
- Includes both A1 and A4 selector drums
- Anti-walk pin system prevents movement under recoil
- Maintains reliability in dirty conditions
- Made in USA with certified materials
❌ Limitations:
- Higher price point than standard triggers
- Requires break-in period (200-300 rounds)
- HK platform-specific (won’t fit standard AR lowers)
FRT-MR3 vs Competitors
| Feature | FRT-MR3 | Import Trigger | Premium Brand X |
|---|---|---|---|
| Material | Tool steel | Cast alloy | Billet steel |
| Finish | Black oxide | Paint | Nickel Teflon |
| Compatibility | HK MR series | Universal | AR-15 |
| Durability | 10,000+ rounds | 2,000 rounds | 5,000 rounds |
| Price | $603.75 | $79.99 | $249.99 |
FRT-MR3 FAQ
Where can I buy the FRT-MR3 online?
Available exclusively at F1Firearms with same-day shipping from Topeka, KS.
How does the FRT-MR3 compare to the FRT-15L3?
The FRT-MR3 is specifically designed for HK MR platforms, while the FRT-15L3 fits standard AR-15 lowers. Both use similar forced reset mechanisms but have different mounting requirements.
What’s included with the FRT-MR3?
Each unit comes with the trigger, anti-walk pins, screws, and both A1/A4 selector drums for complete compatibility.
Is the FRT-MR3 legal in my state?
Trigger legality varies by jurisdiction. Consult local laws before purchase – we cannot ship to restricted areas.
How difficult is installation?
Most users can install in under 15 minutes with basic tools. Includes detailed instructions.
What’s the break-in period?
Expect 200-300 rounds for optimal performance as components mate.
Do you offer law enforcement/military discounts?
Yes – email verification to sales@f1firearms.us.com for pricing.
✅ Same-day shipping from Topeka, KS
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
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