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Questions & Answers
Does this trigger still work on regular ar 15 uppers Expert Answer

The Geissele HK MR 5.56 Rifle Trigger should work in a standard AR15. However, I recommend using the Geissele AR15 trigger at the link below.
https://www.opticsplanet.com/geissele-super-semi-automatic-enhanced-trigger-ssa-e.html

by Hunter, Gear Expert, June 22, 2022
Customer Reviews
Helpful Positive Review
Good trigger, on par with their SSA or G2S model. Breaks at roughly 4lb 13oz. Smooth takeup , breaks pretty clean with very minimal creep. Hopefully that works it’s way out after a bunch of rounds. My other Geissele triggers have virtually no cre...
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10/12 found this helpful
Helpful Positive Review
Geissele MR556 Trigger by Rob, Verified Owner, February 2, 2018
While I ended up returning this trigger NIB to Optics Planet, and ended up going with a Geissele HK 416 SSF instead, the HK Geissele trigger is a definite upgrade in line with what many have come to expect from Geissele. The stock HK trigger is not b...
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6/7 found this helpful
Most Recent Reviews
Since writing my previous review, I have purchased the HK MR556 A4, and installed this trigger along with the Haus Tool 'SELECTOR AXLE HK MR95 HAUS'. All features of the A4 remain operational with the exception that I cannot SAFE the gun unless hamme...
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Most Recent Reviews
I'm always looking for the best deal possible; Optics Planet had the best price for this trigger, Defense Depot had the best price by far for the MR556. The rifle comes with a good trigger, the Geissele is better. The spring design of the Geissele t...
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Most Recent Reviews
awesome upgrade by aznative, Verified Owner, March 27, 2022
The trigger that comes stock on the mr556 is a great trigger. This is just a slight upgrade but it’s worth it and the money. It’s expensive but definitely worth it. It’s crisp and feels great. Optics planet is always amazing and super fast with shipp...
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Read All 5 Reviews
Color:
Black
Trigger Shape:
Curved
Trigger Pull Weight:
4.25 - 4.75 lb
Trigger Pin Size:
Standard Mil-Spec Pin
Hand:
Ambidextrous
Gun Make:
Heckler & Koch
Gun Model:
Heckler & Koch MR556
Condition:
New

Code: 1TO-TGR-05-220-05-220

MPN: 05-220

UPC: 854014005168

List: $475.00Save 10%
$427.50

made-in-usa-flag Made in USA

Help support American manufacturing! Marked models of this product have gone through rigorous review and been certified by the manufacturer as Made in the USA.

Product Info for Geissele Hk Mr 5.56 Trigger

The HK MR 556 trigger is similar to our SSA Trigger and can be used in both the HK 556 and semi-auto HK 416's. After installing the MR 556 trigger you must cock the hammer in order to engage the safety unlike the HK trigger system where you can place the selector on Safe with the hammer forward.image

WARNING: California`s Proposition 65

Specifications for Geissele Hk Mr 5.56 Trigger:

Manufacturer: Geissele
Color: Black
Trigger Shape: Curved
Trigger Pull Weight: 4.25 - 4.75 lb
Trigger Pin Size: Standard Mil-Spec Pin
Hand: Ambidextrous
Gun Make: Heckler & Koch
Gun Model: Heckler & Koch MR556
Gun Type: Rifle
Condition: New
Caliber: 5.56x45mm NATO
Country of Origin: USA

Package Contents:

  • Geissele HK MR 5.56 Rifle Trigger

Geissele Hk Mr 5.56 Trigger Orderable Models

List of Orderable Models

  • Geissele HK MR 5.56 Rifle Trigger Assembly, 4.75 lbs, Black, 05-220 , MPN: 05-220 , UPC: 854014005168 , Code: 1TO-TGR-05-220-05-220
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Last updated 2026-06-15 UTC.