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Q&A for Franklin Armory BFSIII HK-C1 Trigger - Binary Firing System for HK 91/93/MP5 — 52 Questions & 66 Answers

Name Franklin Armory BFSIII HK-C1 Trigger - Binary Firing System for HK 91/93/MP5 (4.1)
$699.99 $597.99 Save 15%
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Q
Mike, guest, from IL, United States, asked on January 18, 2022

Will this fit an HK MP5 22LR

Expert Answer
A
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.

12 of 55 found the following answer helpful.
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Q
Jalen, guest, from OH, United States, asked on December 16, 2023

Does this include the ejector bar?

Manufacturer Answer
A
Answered by Franklin Armory, Manufacturer from NV, United States, on June 04, 2025

No, the HK-C1 does not include the ejector, you re-use the ejector, ejector spring, and pin from your OEM trigger pack.

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Q
Emerica2008, member, from IL, United States, asked on September 25, 2022

Will this work with the Magpul SL grip module? Would I need to purchase any extra parts?

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on September 26, 2022

The Franklin Armory BFSIII HK-C1 Trigger - Binary Firing System for HK 91/93/MP5 will work with the Magpul SL Grip Module. You should not need anything else.

4 of 4 found the following answer helpful.
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Q
mac, member, from IN, United States, asked on March 01, 2025

hello will this work with the MAC or military Army Corps MP5K any help would be greatly appreciated

Manufacturer Answer
A
Answered by Franklin Armory, Manufacturer from NV, United States, on March 12, 2025

Thank you for inquiring about our triggers. The BFSIII HK-C1 should work in most HK 91, 93, MP5 it should also function with variants and clones of these firearms.

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Q
Mr1218, member, from TX, United States, asked on November 23, 2024

Will this work in a MAC MP5 clone?

Manufacturer Answer
A
Answered by Franklin Armory, Manufacturer from NV, United States, on June 04, 2025

The BFSIII HK-C1 should work in most HK 91, 93, MP5 it should also function with variants and clones of these firearms.

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Q
Zac, guest, from PA, United States, asked on July 28, 2018

Will this work in the PTR 9CT?

Expert Answer
A
Answered by Ethan C., Gear Expert, from IL, United States, on September 24, 2018

Yes, this should be compatible.

14 of 16 found the following answer helpful.
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Q
Wayne, member, from AZ, United States, asked on January 16, 2018

will this work with the Heckler&Koch SP5K -the MP5 semi auto civilian version

Expert Answer
A
Answered by Ethan C., Gear Expert, from IL, United States, on January 31, 2018

Yes, this should fit the HK SP5K.

9 of 11 found the following answer helpful.
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Q
Shire Reeve, member, from WI, United States, asked on October 04, 2017

Will this work with an HK SP89?

Expert Answer
A
Answered by Carly R., Gear Expert, from IL, United States, on October 09, 2017

Updated Answer: Yes, it will work.

5 of 8 found the following answer helpful.
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Q
Javy, guest, from FL, United States, asked on May 23, 2025

Hi will this part fit a MKE AP5-P Clone to HK MP5-K? (3) Position 0-1-F?

Manufacturer Answer
A
Answered by Franklin Armory, Manufacturer from NV, United States, on June 04, 2025

The BFSIII HK-C1 should work in most HK 91, 93, MP5 it should also function with variants and clones of these firearms.

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Q
Rusty, guest, from WV, United States, asked on January 08, 2025

Will this function in a Zenith zf-5

Manufacturer Answer
A
Answered by Franklin Armory, Manufacturer from NV, United States, on March 12, 2025

Thank you for inquiring about our triggers. The BFSIII HK-C1 should work in most HK 91, 93, MP5 it should also function with variants and clones of these firearms.

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