Tetragunshop is a Memphis, TN-based retailer specializing in high-performance firearm components. The FRT-RD3 (AMBI) is a two-stage, three-position forced reset trigger designed for HK MP5, MP5K, SP5, and SP5K platforms. This ambidextrous trigger offers enhanced control and precision. Available now for $713, with a limit of one trigger per transaction.
Reviewed by Marcus Tate, Owner & FFL Holder at Tetragunshop. Tennessee-licensed FFL dealer since 2014, USPSA Production-class competitor.
Last updated: May 2026
| Product Type | Forced Reset Trigger |
|---|---|
| Material | High-Grade Steel |
| Manufacturing | CNC Machined |
| Finish | Black Oxide |
| Hardness/Quality | 58-60 HRC |
| Compatibility | HK MP5, MP5K, SP5, SP5K |
| Installation/Usage | Professional Installation Recommended |
| Weight | 3.2 oz |
| Dimensions | 2.5″ x 1.2″ x 0.8″ |
| Country of Origin | USA |
| Condition | New |
| SKU | FRT-RD3-AMBI |
Key Features
- Ambidextrous design for left or right-handed shooters
- Two-stage trigger with three positions for precise control
- CNC machined from high-grade steel for durability
- Black oxide finish for corrosion resistance
- Compatible with HK MP5, MP5K, SP5, and SP5K platforms
Who It’s For
Buy it if:
- You own an HK MP5, MP5K, SP5, or SP5K and want enhanced trigger control
- You prefer an ambidextrous trigger for versatile handling
- You value precision-engineered components for competitive shooting
Skip it if:
- You don’t own a compatible firearm (see our Triggers for alternatives)
- You prefer a single-stage trigger
- You’re looking for a budget option
Pros & Cons
✅ Ambidextrous design for versatile use
✅ Two-stage, three-position trigger for precise control
✅ CNC machined from high-grade steel for durability
✅ Black oxide finish for corrosion resistance
✅ Compatible with HK MP5, MP5K, SP5, and SP5K
❌ Professional installation recommended
❌ Limited to one per transaction
Comparison
| Feature | FRT-RD3 (AMBI) | Cheap Import | Premium Brand |
|---|---|---|---|
| Material | High-Grade Steel | Cast Steel | High-Grade Steel |
| Quality | CNC Machined | Cast | CNC Machined |
| Compatibility | HK MP5 Series | Generic | HK MP5 Series |
| Shipping | Same-Day | 2-3 Weeks | 1-2 Weeks |
| Lifespan/Durability | High | Low | High |
| Price | $713 | $60-$80 | $250+ |
FAQ
Where can I buy FRT-RD3 (AMBI) online?
You can purchase the FRT-RD3 (AMBI) at Tetragunshop (tetragunshop.com).
Is the FRT-RD3 (AMBI) ambidextrous?
Yes, the FRT-RD3 (AMBI) is designed for both left and right-handed shooters.
What firearms is the FRT-RD3 (AMBI) compatible with?
The FRT-RD3 (AMBI) is compatible with HK MP5, MP5K, SP5, and SP5K platforms.
Is professional installation required?
Professional installation is recommended for optimal performance.
What is the return policy?
We offer a 30-day return policy for the FRT-RD3 (AMBI).
✅ Same-day shipping from Memphis, TN
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: Triggers | Full Shop
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