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Will this fit an HK MP5 22LR — 6 Answers

by Mike, from IL, United States Asked on January 18, 2022

Name Franklin Armory BFSIII HK-C1 Trigger - Binary Firing System for HK 91/93/MP5 (4.1)
$699.99 $629.99 Save 10%
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Answered by Hunter, Gear Expert, from OH, United States, on April 12, 2022

Yes, the Franklin Armory BFSIII HK-C1 Trigger - Binary Firing System for HK 91/93/MP5 should work with the HK MP5 22LR.

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A
Answered by Salsa Cheese, guest, from KY, United States, on January 02, 2025

Directly from FA. This will NOT work in the HK MP5 22LR.

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Answered by CO, guest, from WI, United States, on December 26, 2024

Does not work with .22lr

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Answered by Fred, member, from WI, United States, on December 24, 2024

I just bought both because of this answer. It is wrong.

You can NOT use the Franklin binary trigger on the HK MP5 22LR (made by umarex)

The trigger group is totally different. Maybe you can get a standard semi HK 91/93/MP5 trigger group to work in the HK MP5 22LR umarex and convert that?

But with the stock umarex parts and this kit, will NOT work. Not even close enough to try. umarex is totally different.

If anyone figures out a way to do this, please post a link to a video or a parts list & instructions. I want it to happen.

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Answered by McDonalds, guest, from VA, United States, on November 29, 2024

Hi Mike: The Franklin Armory BFSIII HK-C1 trigger WON'T fit a Umarex MP5 chambered in .22 LR. That firearm does not use HK style trigger packs, which is required in order to work in an HK style platform. Franklin Armory would need to contract with Umarex to develop an entire new firing system for it to function with the MP5 .22 LR clone.

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Answered by pottsie, member, from OR, United States, on January 14, 2024

I reached out to Franklin Armory with this exact question and was told no, it will not work on the MP5 22LR. The exact response:

"Unfortunately, the HK MP5 22lr made by Umarex is not compatible with our HK-C1 trigger."

If someone knows this to be false, I would greatly appreciate learning that.

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