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12/1/2025 7:44:06 PM EDT
Anyone ever seen this before?  OKAY mag, preban, no outside marks, just the K6 and K2 inside.

Shape is the same as any other 30rd mag, but it has this odd slit on the one side.

Never seen it before, even with my old Vietnam era 30’s



12/1/2025 7:54:32 PM EDT
[#1]
AR-18 mag.
I'm like a bad doctor, I have no patience.
12/1/2025 7:55:37 PM EDT
[#2]
Congratulations, you've found an AR18/180 magazine!

They're fairly uncommon and a neat bit from Armalite's design history, and work just fine in ARs, unlike many other magazine conversions that make the magazine unusable in its original firearm or caliber.
12/1/2025 8:31:57 PM EDT
[#3]
Quote History
Originally Posted By osprey21:
AR-18 mag.
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Quote History
Originally Posted By osprey21:
AR-18 mag.



Originally Posted By An_Orphanage:
Congratulations, you've found an AR18/180 magazine!

They're fairly uncommon and a neat bit from Armalite's design history, and work just fine in ARs, unlike many other magazine conversions that make the magazine unusable in its original firearm or caliber.


How cool. I always thought they used a proprietary magazine!  

Are they rare?  Wondering if I need to add it to my case of more rare mags or just run and gun it… I was planning to replace the black follower, but if it needs to be original, I will add it back…. Over thinking this I’m sure.
12/1/2025 10:41:36 PM EDT
[Last Edit: 18B30][Edited] [#4]
It’s a converted AR-18O/M-16 mag.  Neither rare or unusual.  

Sterling mags were made of steel and the 40 round is especially nice to find.



18Z50
12/1/2025 11:52:17 PM EDT
[#5]
Quote History
Originally Posted By 18B30:
Neither rare or unusual.  
18Z50
View Quote


Thanks. Gonna drop it into rotation then.

Thanks everyone.
12/19/2025 3:21:38 PM EDT
[#6]
Quote History
Originally Posted By 18B30:
It’s a converted AR-18O/M-16 mag.  Neither rare or unusual.  

Sterling mags were made of steel and the 40 round is especially nice to find.



18Z50
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This. I have 3 or 4 Sterlings. They were the way to go if you wanted a 40 round capacity before the PMags.
"An age of glory passed like a lightning flash. The mandate of heaven passed from you but you didn't see. Times change and power passes. It is the pity of the world."

Song dynasty poet
2/3/2026 8:56:28 AM EDT
[#7]
Quote History
Originally Posted By seand1111:


Thanks. Gonna drop it into rotation then.

Thanks everyone.
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Someone with an AR-180 might be interested.

I can't remember his name but there used to be a guy that "professionally" converted AR15 mags to be used in AR180's using a jig he'd built and that might be one.

Or you could buy an AR-180
Put not your trust in princes, in sons of men in whom there is no salvation.

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