What would "SMG .30 Cal." have been in the Vietnam era?

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I have a gentleman in my hearing clinic who is an army veteran and served in the 1960s. His service record indicates training with "SMG .30 Cal." and I'm really not sure what that would be. The veteran isn't a gun guy and doesn't remember the thing. Knowing what gun/cartridge this is may actually be materially helpful for him. Any ideas?
 
Ain't no American Submachine gun .30 caliber. Maybe a clerk called an M2 Carbine a SMG. There might have been Brownings still around that he would have shot a .30 caliber machine gun.
That's about what I thought. It's repeated on several of his documents, though, years apart. Do you suppose clerks would just repeat whatever they saw on previous forms, or on some primary record?
 
The M2 would be the closest to a SMG in the US inventory. Foreign guns could be different, depending on who calls what caliber .30.
 
A couple of WAG's:

M2 carbine
Thompson 30 carbine light rifle/SMG (I doubt he'd have been officially trained on an experimental/prototype weapon)
A typo
 
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I wouldn't doubt it got carried over from form to form over time.

Thompson 30 carbine light rifle/SMG

Forgot about that one. Doubt he was in tests of foreign weapons to include a Cristobal, either.

What did the French do in .30 Carbine? There used to be loud complaints of corrosive French surplus .30.
 
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Thanks all. I'd initially thought about the Thompson, but a brief search showed it to be even more rare than I'd thought, so it seems pretty unlikely. I figured maybe there was just something I'd never heard of - I'm not completely up to speed on Vietnam-era small arms - but it looks like "M2 Carbine" and "clerical error" are going to be the answers.
 
I wouldn't doubt it got carried over from form to form over time.



Forgot about that one. Doubt he was in tests of foreign weapons to include a Cristobal, either.

What did the French do in .30 Carbine? There used to be loud complaints of corrosive French surplus .30.
They got "a metric crap ton" of M1 carbines from the United States.
 
There's also the possibility that "SMG" is meant to be "standard MG" (normally rendered as GPMG or SPMG).
And over the decade of VN, could have been either some form of M-1919 or the M-60.

There's a longshot chance it was meant to be "Stoner MG" as a belt-fed Squad Auto was one of the possible configurations.

There's not exactly an accountability "chain" for what clerks abbreviate, sadly.
 
service record indicates training with "SMG .30 Cal." and I'm really not sure what that would be.
Could be the Thompson SMG in .30 carbine 😆:rofl:

M-60...........and I will never forget it.
Me neither. LOVED shooting the M60 ... Ah, memories.
 
Me neither. LOVED shooting the M60 ... Ah, memories.
I have lots of M-60 memories, mostly bad. I was 45 Bravo in Germany in 69-70...small arms repair. I spent a lot of time trying to fix broken M-60s; broken because of operator stupidity. Damaged covers because some idiot tried to forcibly close the thing with the bolt in the forward position. Worn sears which made the thing run away . Springs didn't last long. We automatically replaced them on any gun coming in. Soldiers would clean the barrel but not the gas system. Of if they did, they put the gas piston in backwards, which rendered the gun inoperable. It would fire one round and stop.

When you got one running right, they were a sweet deal but...
 
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I have lots of M-60 memories, mostly bad. I was 45 Bravo in Germany in 69-70...small arms repair. I spent a lot of time trying to fix broken M-60s; broken because of operator stupidity. Damaged covers because some idiot tried to forcibly close the thing with the bolt in the forward position. Worn sears which made the thing run away . Springs didn't last long. We automatically replaced them on any gun coming in. Soldiers would clean the barrel but not the gas system. Of if they did, they put the gas piston in backwards, which rendered the gun inoperable. It would fire one shot and stop.

When you got one running right, they were a sweet deal but...

Yes the M60 could be a nightmare when operator headspace and timing were off. I had an old Vietnam vet teach me how to use the M60 and make it run without issues. Another issue I saw was extractors breaking due to a lot of dry firing.
 
Any possibility he could have been trained on non-American arms? The PPSh-41 appeared in Vietnam during that time.
I doubt it. The gentleman was a tanker, and was qualified on the usual stuff: M14, M60, .45 Auto, etc. It seems pretty unlikely that he would have been trained up with anything out of the ordinary, and the more I think on it, the more I suspect the gun was simply the M2.
 
Yes the M60 could be a nightmare when operator headspace and timing were off.
I think you are a bit confused, my friend. Adjusting headspace and timing were operations that needed to performed on an M-2HB 50. cal Browning machine gun. The early ones, at least, did not have a quick change barrel Changing the barrel was a time consuming process. The new barrel needed to have timing and headspace adjusted before firing. This was rectified on modern versions.

There are no headspace and timing adjustments on an M-60
 
I have a gentleman in my hearing clinic who is an army veteran and served in the 1960s. His service record indicates training with "SMG .30 Cal." and I'm really not sure what that would be. The veteran isn't a gun guy and doesn't remember the thing. Knowing what gun/cartridge this is may actually be materially helpful for him. Any ideas?
So when I saw the title of this post on the main page I instantly thought "hmm I bet a 300Blk suppressed 8in barrel full auto M16 would have been a godsend in Vietnam. Especially with the 190gr Hornady SubX bullets.
 
Another issue I saw was extractors breaking due to a lot of dry firing
We were seeing that problem as early as 1969.. Replacing the extractor spring often solved the problem but they were breaking. With a worn or weak spring, the extractor often slipped past the cartridge extractor groove, causing a stoppage. Clearing the feed tray and slamming the bolt forward in an attempt to grab and extract the errant case could often break the extractor, or just hopelessly trash the rim on the stuck cartridge. The way to avoid all of this was to replace every spring on the gun every time it came into the shop. Extractors were often replaced as well.

Never dry fire an M-60. That was one of the first things I learned. The second was: Never try to close the cover with the bolt in the forward position.

Somebody tell that to Hickock 45.
 
I doubt it. The gentleman was a tanker, and was qualified on the usual stuff: M14, M60, .45 Auto, etc. It seems pretty unlikely that he would have been trained up with anything out of the ordinary, and the more I think on it, the more I suspect the gun was simply the M2.
If he was a tanker then the M2 is the only logical choice. I thought maybe the M3 and somebody just misremembered the caliber, but you suggest this is written in his service record…
 
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