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Rare Breed TriggersForced reset triggers
FRT-MR3™
Fits
HK MR223 / MR556
Face
Curved
Ships
1–2 business days, tracked
HK MR223 / MR556

FRT-MR3™

The FRT-MR3 is Rare Breed's forced reset trigger built for the Heckler & Koch MR223 / MR556 platform — fast, smooth, semi-automatic reset for the HK owner.

$525.00$367.5030% off
Free US shipping · 1–2 business days · tracked
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FRT-MR3™
In stock · ships in 1–2 business days
$525.00$367.50
Total (shipping included) $367.50
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Overview

The FRT-MR3 brings Rare Breed's forced reset trigger to the Heckler & Koch MR223 / MR556 platform. It is a semi-automatic trigger — one round per function — with the same forced-reset feel FRT owners expect, engineered for the HK fire-control geometry rather than a standard AR-15.

Genuine Rare Breed Triggers®. Because HK platforms differ from a mil-spec AR-15, confirm your model before ordering; our team can help. This is the curved-face MR3; a flat version is also offered.

Made in the USA and shipped fast and discreetly.

Guides: Are FRTs legal? · Spot a fake · What is an FRT?

Specification
BrandRare Breed Triggers
ModelFRT-MR3
PlatformHK MR223 / MR556
TypeForced Reset Trigger (semi-automatic)
Trigger faceCurved
ConditionNew
OriginMade in USA

Frequently asked questions

What does the FRT-MR3 fit?
It is built for the HK MR223 / MR556 platform, not a standard AR-15. Confirm your exact model before ordering.
Is it a genuine Rare Breed trigger?
Yes — we sell authentic Rare Breed Triggers® products only.
Curved or flat?
This is the curved MR3; a flat-face MR3 is also available.
Is it legal?
FRTs are federally treated as semi-automatic per the 2025 settlement; some states restrict them. Check your state.

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