FRT-RD3™ (AMBI)
4.9 / 5
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163 Verified Reviews
The FRT-RD3™ (AMBI) is Rare Breed Triggers’ most versatile platform expansion — a fully ambidextrous, two-stage, 3-position forced reset trigger engineered from the ground up for the HK MP5, MP5K, SP5, and SP5K. Two-stage precision pull, patented BCG-driven forced reset, and true ambidextrous controls — all in one purpose-built drop-in trigger assembly for the world’s most iconic sub-gun platform.
| Model | FRT-RD3™ (AMBI) |
| Type | Two-Stage Forced Reset Trigger |
| Controls | Fully Ambidextrous |
| Positions | 3 (Safe / Two-Stage / Forced Reset) |
| Compatible | HK MP5, MP5K, SP5, SP5K |
| Material | Tool-Grade Steel, Precision Machined |
| Install | Drop-In, No Modification Required |
| Legal Status | Federally Legal — DOJ Confirmed |
| Warranty | Manufacturer’s Limited Warranty |
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What Is the FRT-RD3™ (AMBI)?
The FRT-RD3™ (AMBI) brings Rare Breed Triggers’ patented forced reset technology to one of the most beloved sub-gun platforms in the world — the HK MP5 family. Engineered specifically for the MP5, MP5K, SP5, and SP5K trigger group geometry, it delivers a fully ambidextrous two-stage forced reset trigger experience that no other product on the market provides.
The “AMBI” designation means true ambidextrous controls — position selector and safety accessible from both sides of the trigger pack, making it equally suited for left-handed and right-handed shooters without additional modification. Combined with the two-stage pull and patented BCG-driven forced reset, the FRT-RD3™ (AMBI) is the most complete trigger upgrade available for any HK MP5 or SP5 platform rifle.
Like all products from Rare Breed Triggers, the FRT-RD3™ (AMBI) carries federally confirmed legal status, ships with the manufacturer’s warranty, and is available exclusively at rare-breedtriggers.com. Read more on our blog.
Two-Stage Pull in Two Stages
Light, consistent resistance to the wall. Pre-load with confidence — accessible from either side with ambidextrous controls.
Defined wall, clean crisp break. Deliberate pressure fires the round. No creep, no stacking — precise and repeatable every time.
Three Positions. Total Command.
Trigger sear disconnected. Firearm cannot fire. Fully ambidextrous — accessible from both sides of the trigger pack.
Precision two-stage pull — defined first stage, clear wall, crisp break. Ideal for deliberate, precision-focused shooting on the MP5/SP5 platform.
Patented BCG-driven reset engages. Mechanically faster, more consistent reset than any spring-driven system. One round per pull. Federally legal.
Built for the Iconic MP5
True left- and right-hand selector and safety — every position accessible from either side without compromise.
Defined first stage and crisp second-stage break — precision control and staged confidence on every shot.
The bolt carrier group drives the trigger forward after each shot — the same patented Rare Breed forced reset for the MP5/SP5.
All primary wear surfaces precision machined from tool-grade steel — built to match the durability standard of the HK platform.
One round per trigger pull. Confirmed by the landmark DOJ settlement with Rare Breed Triggers.
Every unit purchased from Rare Breed Triggers ships with full manufacturer warranty. Only direct purchases qualify.
Federally Legal. DOJ Confirmed.
The FRT-RD3™ (AMBI) fires one round per single function of the trigger in every position. Under the National Firearms Act and Gun Control Act, a machine gun fires more than one round per trigger function. The FRT-RD3™ (AMBI) does not meet this definition — confirmed by the DOJ settlement with Rare Breed Triggers.
State laws vary. Always verify before purchasing. Read our full legal guides on the blog.
Frequently Asked Questions
The FRT-RD3™ (AMBI) is purpose-engineered for the HK MP5, MP5K, SP5, and SP5K. It is not compatible with HK MR-series or AR-15 platforms.
AMBI stands for ambidextrous. The FRT-RD3™ (AMBI) features fully ambidextrous position selector and safety controls — accessible from both sides of the trigger pack for left- and right-handed shooters.
Yes. The FRT-RD3™ (AMBI) is a federally legal semi-automatic trigger — one round per pull in every position. Confirmed by the DOJ settlement with Rare Breed Triggers. State laws vary — always verify before purchasing. Read our legal guides.
No. The FRT-RD3™ (AMBI) is a drop-in assembly — no machining or permanent modification to your firearm required.
The only authorized source is rare-breedtriggers.com. No authorized third-party resellers exist.
Related Products
Single-stage 3-position forced reset trigger for the HK MR223 and MR556.
Two-stage 3-position forced reset trigger for mil-spec AR-15 lowers.
Platform guides, installation tips, and legal updates on the Rare Breed blog.
Order the FRT-RD3™ (AMBI) Today
Ambidextrous. Two-stage. Forced reset. The definitive trigger upgrade for your HK MP5, MP5K, SP5, or SP5K.
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