Rare Breed FRT-RD3 (SEF) Two-Stage Forced Reset Trigger for HK MP5 / SP5 – 3-Position
Original price was: $615.00.$560.00Current price is: $560.00.
Rare Breed’s two-stage MP5 FRT for HK MP5 and SP5 pattern firearms. This version fits SEF grip frames only.
- For SEF grip frames
- Two-stage pull, 3-position
- Works with the factory carrier
- Made in the USA
- Free shipping3–5 business days, ships from Texas
- Legal states onlySee where we ship
- 30-day returnsOn unused, uninstalled items. Policy
- Help before you buyText (940) 217-4704
Check compatibility first: read the requirements in the description below. Installed triggers can’t be returned, so text us if you’re unsure.
The Rare Breed FRT-RD3 (SEF) is a two-stage MP5 FRT designed from the ground up for HK roller-delayed firearms: the MP5, MP5K, SP5 and SP5K. This version fits SEF grip frames, which use S-E-F letter markings and a single selector lever on the left side, and installs with no modifications to your firearm.
- Made for HK MP5 / MP5K / SP5 / SP5K
- For SEF grip frames
- Two-stage pull
- 3-position selector: Safe / Semi / FRT
- No modification to your firearm
- Made in the USA
The MP5 FRT Trigger That Fits Without Modification
Roller-delayed firearms work very differently from AR-15s, so they need a forced reset trigger designed for them. The FRT-RD3 works with the factory semi-auto bolt carrier and with receivers that have the factory full-auto carrier denial block, so there is nothing to cut, file or replace.
Check your grip frame first. This listing is the SEF version. If your grip frame is AMBI, order the FRT-RD3 (AMBI). Prefer a complete drop-in lower instead? See the MARS FRT lowers for the HK SP5 and SP5K.
FRT-RD3 (SEF) Specifications
| Brand | Rare Breed Triggers |
|---|---|
| Model | FRT-RD3 (SEF) |
| Platform | HK MP5 / MP5K / SP5 / SP5K and similar roller-delayed firearms |
| Grip frame | SEF |
| Pull | Two-stage |
| Selector | 3-position |
| Materials | 7075 anodized aluminum, heat-treated 4140 steel |
| Origin | Made in the USA |
| SKU | FTS-RB-RD3-SEF |
Compatibility & Requirements
- Only fits SEF grip frames. Check your markings before ordering.
- Uses the factory semi-auto bolt carrier
- Compatible with receivers that have the factory full-auto carrier denial block
AMBI or SEF? AMBI grip frames use pictogram markings and have levers on both sides. SEF grip frames use S-E-F letters and one lever on the left. Not sure? Text us a photo of your grip frame.
What’s in the Box
- 1 x FRT-RD3 trigger
- 1 x SEF single-sided safety selector
- 1 x 1/16″ Allen key
- 1 x 3/32″ Allen key
Compare Similar Options
- Rare Breed FRT-RD3 (AMBI)The same trigger for AMBI grip frames.
- MARS FRT Lower – HK SP5Complete lower with the FRT pre-installed.
- MARS FRT Lower – HK SP5KComplete lower for the SP5K.
- All HK & MP5 FRTEvery MP5 FRT option we carry.
FRT-RD3 (SEF) FAQs
Does the FRT-RD3 fit the SP5?
Yes. The FRT-RD3 fits HK MP5, MP5K, SP5 and SP5K pattern firearms, as long as you choose the version that matches your grip frame (AMBI or SEF).
Do I need to modify my MP5 or SP5?
No. The FRT-RD3 works with the factory semi-auto bolt carrier and receivers with the factory carrier denial block.
What is the difference between AMBI and SEF?
They fit different grip frames. AMBI frames have pictogram markings and levers on both sides; SEF frames have S-E-F letter markings and a single left-side lever.
Why Buy From FRT Trigger LLC
- Free 3–5 day shipping on every order, from Wichita Falls, Texas. Shipping details
- Help before you buy: text (940) 217-4704 with your make and model.
- 10% off your first order with code FRTTEXAS10, or 20% with crypto. See coupons
- Buying several? Save up to 40% with wholesale pricing.
Unused, uninstalled items can be returned within 30 days. Refund policy.
Forced reset triggers are restricted in some states. We do not ship FRTs to California, Colorado, Connecticut, Delaware, Hawaii, Illinois, Maryland, Massachusetts, New Jersey, New York, Oregon, Rhode Island, Washington or Washington, D.C. Please confirm your local laws before ordering. See state restrictions. This is general information, not legal advice.
Learn more: What is a forced reset trigger? · How an FRT works · FRT trigger types · Pros and cons of FRTs
