FRT-MR3 Forced Reset Trigger for HK MR223 & MR556
Polymer80Buy is a Rock Springs, WY-based retailer specializing in high-performance firearm components. The FRT-MR3 is a single-stage forced reset trigger designed specifically for HK MR223 and MR556 platforms. Engineered for rapid fire control with a 3-position selector, this trigger delivers unmatched performance in its class. Available now for $603.75 with same-day shipping.
Reviewed by Marcus Webb, Founder & Lead Builder at Polymer80Buy. 14 years in the P80/Glock aftermarket, 3,000+ kits shipped.
Last updated: May 2026
FRT-MR3 Specifications
| Product Type | Forced Reset Trigger |
|---|---|
| Material | Tool steel with hardened contact surfaces |
| Manufacturing | CNC machined to ±0.001″ tolerances |
| Finish | Black oxide corrosion-resistant coating |
| Hardness | 58-60 HRC on critical wear components |
| Compatibility | HK MR223, MR556 platforms |
| Installation | Drop-in with included anti-walk pins |
| Weight | 3.2 oz (complete assembly) |
| Dimensions | 2.75″ x 1.125″ x 0.625″ |
| Country of Origin | USA |
| Condition | New in factory packaging |
| SKU | FRT-MR3TM |
Key Features
- True single-stage forced reset mechanism – no trigger reset required between shots
- Includes both A1 and A4 selector drums for full compatibility
- Military-grade anti-walk pin system prevents lateral movement
- Precision-machined sear surfaces for consistent break and reset
- 3-position selector allows for safe/semi/FRT operation
Who Should Buy the FRT-MR3
Buy it if: You own an HK MR223/MR556 and want the most advanced trigger system available. Competitive shooters, tactical professionals, and firearms enthusiasts who demand precision engineering will appreciate the FRT-MR3’s performance.
Skip it if: You’re looking for a basic mil-spec trigger (check our standard triggers) or need compatibility with other platforms (consider the FRT-15L3 for AR-15 platforms).
FRT-MR3 Pros & Cons
- ✅ Engineered specifically for HK MR series rifles
- ✅ Includes all necessary hardware for installation
- ✅ 3-position selector maintains safe operation
- ✅ Made in USA with premium materials
- ✅ Backed by manufacturer’s warranty
- ❌ Higher price point than standard triggers
- ❌ Requires proper installation for optimal performance
FRT-MR3 vs Competitors
| Feature | FRT-MR3 | Budget Import | Premium Brand X |
|---|---|---|---|
| Material | Tool steel | Cast alloy | Billet steel |
| Quality | Precision CNC | Mass production | Hand-fitted |
| Compatibility | HK MR only | Universal fit | AR platform |
| Shipping | Same-day | 3-4 weeks | 1-2 weeks |
| Lifespan | 50,000+ rounds | 5,000 rounds | 30,000 rounds |
| Price | $603.75 | $65-80 | $250+ |
FRT-MR3 FAQ
Where can I buy FRT-MR3 triggers online?
Polymer80Buy (polymer80buy.com) carries authentic FRT-MR3 triggers with same-day shipping from our Rock Springs, WY facility.
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 pattern rifles. They’re not interchangeable.
Are there FRT-MR3 reviews available?
Yes, you’ll find detailed FRT-MR3 reviews on firearms forums and YouTube. Check our video section above for a demonstration.
What’s included with the FRT-MR3?
Each kit contains: 1 trigger, 2 anti-walk pins, 4 anti-walk pin screws, A1 selector drum, A4 selector drum, and installation instructions.
Is the FRT-MR3 legal in my state?
Firearm laws vary by jurisdiction. Consult local regulations before purchasing any trigger modification.
How difficult is installation?
The FRT-MR3 is designed as a drop-in unit, but we recommend professional installation for optimal performance and safety.
What’s your return policy?
We offer 30-day returns on unused items in original packaging. See our full policy at checkout.
✅ Same-day shipping from Rock Springs, WY
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: Triggers | Full Shop
This review is based on hands-on testing and customer feedback from our Rock Springs facility. As with all firearm components, proper installation and maintenance are essential for safe operation.
Last updated: May 2026
Reviews
There are no reviews yet.