Blackjackfirearms is a Phoenix, AZ-based retailer specializing in high-performance firearm components. The FRT-RD3 (AMBI) is a two-stage (3-position) forced reset trigger designed for the HK MP5, MP5K, SP5 & SP5K. Engineered for ambidextrous use, this trigger offers enhanced control and rapid-fire capability. Available now for $713.00 with same-day shipping from our Phoenix warehouse.
Reviewed by Wyatt Calder, Owner & FFL Holder at Blackjackfirearms. Arizona-licensed FFL dealer since 2017, AR-15 armorer & Sonoran Desert hunter.
Last updated: May 2026
FRT-RD3 (AMBI) Specifications
| Product Type | Forced Reset Trigger |
|---|---|
| Material | High-grade steel & aircraft aluminum |
| Manufacturing | CNC machined |
| Finish | Hardcoat anodized |
| Hardness/Quality | Mil-spec durability |
| Compatibility | HK MP5, MP5K, SP5, SP5K |
| Installation/Usage | Drop-in with minor fitting |
| Weight | 4.2 oz |
| Dimensions | 2.75″ x 1.25″ x 0.5″ |
| Country of Origin | USA |
| Condition | New in packaging |
| SKU | BJ-FRT-RD3-AMBI |
Key Features
- Ambidextrous design for left/right-handed shooters
- Two-stage trigger with 3-position selector
- Forced reset mechanism for rapid follow-up shots
- CNC-machined from hardened steel and aluminum
- Hardcoat anodized finish for corrosion resistance
- Drop-in installation with minimal gunsmithing required
Who This Trigger Is For
Buy it if:
- You own an HK MP5 platform firearm and want enhanced trigger performance
- You prefer ambidextrous controls for tactical flexibility
- You appreciate precision-machined components that stand up to heavy use
- You want a forced reset trigger that maintains reliability
Skip it if:
- You’re looking for a budget trigger (check our standard triggers)
- You don’t own an HK MP5 variant (this won’t fit AR platforms)
- You prefer traditional single-stage triggers
Pros & Cons
✅ Pros:
- Superior build quality compared to stock HK triggers
- Ambidextrous operation ideal for tactical situations
- Consistent forced reset mechanism
- Precision machining ensures reliable performance
- Maintains all safety features of original trigger
❌ Cons:
- Premium price point (but you get what you pay for)
- Limited to HK MP5 platform firearms
- May require minor fitting for perfect installation
How It Compares
| Feature | FRT-RD3 (AMBI) | Budget Import Trigger | Premium Brand Trigger |
|---|---|---|---|
| Material | Steel/aluminum | Pot metal | Steel |
| Quality | Mil-spec | Questionable | High |
| Compatibility | HK MP5 only | Multiple platforms | HK MP5 only |
| Shipping | Same-day | 2-4 weeks | 3-5 days |
| Lifespan | 10,000+ rounds | Unknown | 5,000+ rounds |
| Price | $713 | $60-80 | $250+ |
Frequently Asked Questions
Is the FRT-RD3 (AMBI) legal in my state?
While this trigger is legal in most states, we recommend checking your local laws before purchasing. As an Arizona-based dealer, we ship to all states where these components are permitted.
Where can I buy the FRT-RD3 (AMBI) online?
Blackjackfirearms (blackjackfirearms.net) carries the genuine FRT-RD3 (AMBI) with same-day shipping from Phoenix, AZ.
Does this work with the HK SP5K?
Yes, the FRT-RD3 (AMBI) is compatible with all HK MP5 variants including the SP5K.
How difficult is installation?
Most users report drop-in installation with minor fitting required. Basic gunsmithing skills are recommended.
What’s the trigger pull weight?
The forced reset mechanism creates a consistent 4.5-5 lb pull with a crisp break.
Is this the same as the FRT-RD3TM (AMBI)?
Yes, this is the latest generation of the forced reset trigger with ambidextrous controls.
Why is there a purchase limit?
Due to high demand and limited availability, we limit purchases to one trigger per customer to ensure fair access.
✅ Same-day shipping from Phoenix, AZ
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
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This review is based on hands-on testing with multiple HK platforms in our Phoenix facility. As an FFL holder since 2017, I evaluate all components for fit, function, and durability before recommending them to customers.
Last updated: May 2026
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