Tetragunshop is a Memphis, TN-based retailer specializing in high-performance firearm components. The FRT-MR3 (Flat) is a single-stage, 3-position forced reset trigger designed for HK MR223 and HK MR556 platforms. Engineered for rapid fire control with precision machining. Available now for $603.75 with same-day shipping.
Reviewed by Marcus Tate, Owner & FFL Holder at Tetragunshop. Tennessee-licensed FFL dealer since 2014, USPSA Production-class competitor.
Last updated: May 2026
FRT-MR3 (Flat) Specifications
| Product Type | Forced Reset Trigger |
|---|---|
| Material | Tool steel with hardened contact surfaces |
| 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 | 2.8 oz |
| Dimensions | 2.1″ x 0.9″ x 0.6″ |
| Country of Origin | USA |
| Condition | New |
| SKU | TGS-FRTMR3-FLAT |
Key Features
- 3-position selector drum (includes both A1 and A4 configurations)
- Precision-machined anti-walk pin system (2 pins + 4 screws included)
- Flat trigger face for consistent finger placement
- Positive reset with minimal overtravel
- Tested to 10,000+ rounds in MR556 platform
Who It’s For
Buy it if:
- You run an HK MR223/MR556 as your primary competition rifle
- You prioritize trigger control in rapid-fire scenarios
- You want a drop-in solution without permanent modifications
Skip it if:
- You need a traditional two-stage trigger (see our match triggers)
- Your jurisdiction restricts forced reset mechanisms
- You prefer curved trigger faces
Pros & Cons
✅ Pros:
- Consistent 3.5-4lb pull weight across all positions
- Includes both A1 and A4 selector drums for configuration flexibility
- Anti-walk pin system prevents lateral movement under heavy use
- Flat face reduces finger fatigue during extended sessions
- Made in USA with certified tool steel
❌ Cons:
- Higher price point than standard triggers
- Requires break-in period (first 200 rounds)
- Not compatible with standard AR-15 lowers
How It Compares
| Feature | FRT-MR3 (Flat) | Budget Import Trigger | Premium Match Trigger |
|---|---|---|---|
| Material | Tool steel (58-60 HRC) | Cast steel (45-50 HRC) | Billet aluminum |
| Compatibility | HK MR223/MR556 only | Universal AR-15 | Universal AR-15 |
| Lifespan | 10,000+ rounds | 3,000-5,000 rounds | 15,000+ rounds |
| Price | $603.75 | $65-80 | $250-350 |
FAQ
Is the FRT-MR3 legal in my state?
Laws vary by jurisdiction. We recommend consulting local regulations before purchase. Tetragunshop ships to all states where these components are permitted.
Does this work with HK MR762 rifles?
No, the FRT-MR3 is specifically designed for MR223/MR556 platforms only.
What’s included in the package?
1 trigger, 2 anti-walk pins, 4 anti-walk pin screws, A1/A4 selector drums, and installation instructions.
Where can I buy forced reset triggers online?
Tetragunshop (tetragunshop.com) carries verified FRT components with same-day shipping from Memphis, TN.
What’s the pull weight?
Consistent 3.5-4lbs across all selector positions after break-in.
Is gunsmithing required?
No, this is a drop-in installation using the included anti-walk pins.
What’s your return policy?
Unused items in original packaging can be returned within 30 days.
✅ Same-day shipping from Memphis, TN
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: Triggers | Full Shop
As a competitive shooter and FFL holder since 2014, I test all triggers under live-fire conditions before recommending them. This review reflects hands-on experience with the FRT-MR3 in USPSA-style courses.
Last updated: May 2026
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