Upper receiver with "H." stamped on bottom of take down lug(?)

[Yarome]

A new to me stamp and just curious if anyone has seen this marking and knows who the stamp belongs to.

An AR upper and located on the bottom of the rear take down lug.... "h."

~TIA

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[Nosferatu]

Anchor Harvey, maybe?

AR15 Forge Markings

 

[Yarome]

Anchor Harvey, maybe?

It has the splintered AH side mark and definitely out of their forge, but the lug bottom stamp got me curious if that's a maker mark or some other meaning I'm unaware of. It's the first time I've ever run across it.

 

[Unka-Boo]

Huh....never seen that before...

 

[TTSX]

Mysterious ":h" or "4:" AR15 upper markings

This PSA upper I just got doesn't have any of the normal forge markings above the forward assist but has this weird :h or 4: (depending on how you look at it). Anyone know who this might be forged by? More for my curiosity than anything else. It is 7075 and seems well machined based on my...

carolinafirearmsforum.com

Only thing I could find that seems plausible. Shift indicator or CNC machine identifier.

 

[Yarome]

Mysterious ":h" or "4:" AR15 upper markings

This PSA upper I just got doesn't have any of the normal forge markings above the forward assist but has this weird :h or 4: (depending on how you look at it). Anyone know who this might be forged by? More for my curiosity than anything else. It is 7075 and seems well machined based on my...

carolinafirearmsforum.com

Only thing I could find that seems plausible. Shift indicator or CNC machine identifier.

Good find. It seems like if it was one of those then it would be stamped or cut, vs., a forged mark, but it does give a lead... the guy mentioned he got his from PSA.

Along those lines... maybe a mold identifier to track QC of the actual molds(?) It just seems odd since I've seen a crap ton of forged uppers and never run across one with a mark in that location. Kinda leading me to think it was a brand or some other meaning related.

It actually calipered up quite nicely and more just a curiosity for edification, now.