FRT-MR3
About this product
FRT-MR3 Forced Reset Trigger for HK MR223 & MR556
Polymer80Hub is a Johnson City, TN-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. This precision-engineered trigger delivers consistent performance with a clean break and rapid reset. Available now for $603.75 with same-day shipping.
Reviewed by Derrick Cole, Range Master & Reviewer at Polymer80Hub. 19 years competitive shooting, product tester for 3 manufacturers.
Last updated: May 2026
| Product Type | Forced Reset Trigger |
|---|---|
| Material | Tool steel |
| Manufacturing | CNC machined |
| Finish | Black nitride |
| Hardness/Quality | 58-60 HRC |
| Compatibility | HK MR223, MR556 |
| Installation | Drop-in with anti-walk pins |
| Weight | 3.2 oz |
| Dimensions | Standard HK trigger footprint |
| Country of Origin | USA |
| Condition | New |
| SKU | FRT-MR3 |
Key Features
- Single-stage forced reset mechanism
- Includes both A1 and A4 selector drums
- Anti-walk pin system included
- Precision CNC machining for consistent performance
- Black nitride finish for corrosion resistance
Who It’s For
Buy it if: You own an HK MR223 or MR556 and want a reliable forced reset trigger from a reputable manufacturer.
Skip it if: You need a trigger for standard AR-15 platforms (consider our other trigger options instead).
Pros & Cons
✅ Designed specifically for HK MR platforms
✅ Includes both selector drum options
✅ Anti-walk pin system prevents movement
✅ Precision CNC machining for reliability
✅ Black nitride finish resists wear
❌ Higher price point than standard triggers
❌ Limited to HK MR223/MR556 platforms
| Feature | FRT-MR3 | Competitor A | Competitor B |
|---|---|---|---|
| Material | Tool steel | Cast steel | Billet aluminum |
| Quality | 58-60 HRC | 50-52 HRC | N/A |
| Compatibility | HK MR only | Multi-platform | AR-15 only |
| Shipping | Same-day | 3-5 days | 1-2 weeks |
| Lifespan | 50,000+ rounds | 20,000 rounds | 30,000 rounds |
| Price | $603.75 | $450 | $650 |
FAQ
Where can I buy the FRT-MR3 online?
Available at Polymer80Hub (polymer80hub.com) with same-day shipping from Johnson City, TN.
How does the FRT-MR3 compare to the FRT-15L3?
The FRT-MR3 is specifically designed for HK MR platforms, while the FRT-15L3 works with standard AR-15 lowers.
What’s included with the FRT-MR3?
The package includes the trigger, anti-walk pins, screws, and both A1 and A4 selector drums.
Is installation difficult?
It’s a drop-in installation with included anti-walk pins, but we recommend professional installation if you’re unfamiliar with trigger work.
What’s the trigger pull weight?
The forced reset mechanism creates a consistent pull weight of approximately 4.5-5 lbs.
Does this work with all HK MR models?
Yes, it’s compatible with all HK MR223 and MR556 variants.
What’s your return policy?
We offer 30-day returns on unused items in original packaging.
✅ Same-day shipping from Johnson City, TN
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: Triggers | Full Shop
Specs at a glance
What's in the box
- FRT-MR3