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WTK: What do the acronyms HJLA and J reference on HK91 barrels?


Yahamshari

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Hello.

The 17.716" barrels on my 1979 HK91 A-2 and A-3 rifles are factory marked HJLA on one side. I reached out multiple times via email and telephone to HK-USA in Columbus, GA but as in the past no one answers the telephone there or reply to emails or return calls. So I sent an email to H&K GmbH. Someone there replied that "the markings indicate the hammer-forging machine that was used to manufacture the barrels," which I am not convinced of. A fellow HK enthusiast advised that HJ reference the manufacturing year (79). Q.1 What do LA reference?

Parts
A B C D E F G H I J
0 1 2 3 4 5 6 7 8 9

Receivers

A B C D E F G H I K
0 1 2 3 4 5 6 7 8 9

The above confirm that the barrels are proper for my HK91s ("HK" date code 79).

Now, below HJLA both barrels are marked J near the breech. HK USA replied that "J is reserved for proof house use." Q.2 What does that really mean and is it true?

This RFI is cross-listed on HKPRO, HK ProShop, The Firing Line, Carolina Firearms Forum, Carolina Shooter Club, M14 Forum, and CMP.

Thank you.

 

Edited by Yahamshari
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