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Q&A for Jacob Grey Firearms LRBHO Actuator Kit — 5 Questions & 4 Answers

Name Jacob Grey Firearms LRBHO Actuator Kit
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Q
TonyE45, guest, from CA, United States, asked on October 13, 2023

Will this work with SharpBros Jack9 lower?

Manufacturer Answer
A
Answered by Jacob Grey, Manufacturer from SC, United States, on October 24, 2023

Our LRBHO is engineered and designed for intended use in the JG9 upper/lower receivers, I cannot guarantee it will work with another manufacturers product. The LRBHO will not work with MIL Spec Upper receivers, it must be used with a 9mm upper that has a cut of for a LRBHO, which allows it to engage. Same for the lower receiver, which has special cut outs and a slot for the pin. I have attached a link for installation video, which may be helpful. We do offer our 9mm receiver set on our website, which includes the LRBHO. https://jacobgreyfirearms.com/product/jg9-billet-aluminum-stripped-receiver-set-anodized/.

https://www.youtube.com/watch?v=cHIlvlThttA

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Q
Ziggy, member, from CA, United States, asked on January 16, 2023

Will this work on my PSA PX9 lower?

Expert Answer
A
Answered by Ethan, Gear Expert, from IL, United States, on March 16, 2023

Yes, the Jacob Grey Firearms LRBHO Actuator Kit would be compatible with your PSA PX-9 lower receiver. This kit includes:
4140 Steel Ejector
Steel LRBHO Actuator
Roll Pin
Lightened Bolt Catch Spring
Allen Wrench
Threaded Bolt Catch Screw

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Q
Icebear, guest, from MN, United States, asked on August 22, 2022

Will this lrbho kit work with 80% arms 9 mm Glock lower ?

Expert Answer
A
Answered by Ethan, Gear Expert, from IL, United States, on September 13, 2022

Yes, however, you must first purchase and install the Jacob Grey Lightened Bolt Catch Spring for the Jacob Grey Custom LRBHO Actuator Kit to function properly.

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Q
Josh, guest, from IL, United States, asked on March 12, 2022

Will this work on an AR9 psa gen4 glock mags

Expert Answer
A
Answered by Ethan, Gear Expert, from IL, United States, on April 22, 2022

Yes. The Jacob Grey Custom LRBHO Actuator Kit would be compatible with your lower. However, you need to use the Jacob Grey Custom lightened bolt catch spring (found on the manufacturers website), in order for the LRBHO to function properly. Using too heavy of a buffer or too powerful of a spring may cause the last round bolt hold open to become inoperable.

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Last updated 2025-11-12 UTC.