M10/45 40 round magazine Cobray stamped?

[Abacab]

I was offered a couple of .45ACP M10 magazines that hold 40 rounds. As far as I know, Powder Springs never made a 40 round magazine; I reserve the right to be wrong. The mags are parkerized, cobray stamped and do not appear to be welded together. Can anyone tell me what the history is on these? As in, who made them, are they worth buying etc?

 

[timkel]

I do not believe any 40 Mag's were made pre-auction. One of the Later mfg like RPB, SWD or Cobray did make 40rd mags like you describe. Can you post a pic of the cobray stamp. The original PS cobray stamp looks different then the later post auction cobray mfg stamp.

 

[GUTTERRATT]

Also the 40rd mags if I am not mistaken only hold around 36rds. I don't know why they call them 40rd magazines but they do...

 

[Abacab]

Also the 40rd mags if I am not mistaken only hold around 36rds. I don't know why they call them 40rd magazines but they do...

Yeah I just loaded it. I got 39 in it.

 

[bengalslover2006]

I own a couple of the factory stamped cobray mags for the m10/45... They were pricey to buy

 

[bengalslover2006]

They are 40 round mags

 

[Jack007]

The 40rd mags were made by CMP in Atlanta. They were the brainchild of Wayne Daniel. When the open bolt semis were approved for sale by ATF, there was a sudden need for magazines. There were nowhere enough mags in 9mm or .380 to satisfy the perceived aftermarket demand. (The decision was made to ship guns with only one mag). Instead of just buying more cheap surplus Grease gun mags and modding them to fit, CMP produced a prototype 40rd mag. This was an extra 10rds and made for great marketing..."the ultimate in Ingram firepower" was the slogan. After the demise of RPB in 1982, they vanished.
While nowhere as robust as the GG mags, they were reliable. In the old days I shot thousands of rounds through them with no failures to remember. They were pricey, in the $30-40 price range. GG mags could be had for $5-7.
I still have 15 or 20 still in the plastic wrap that I'll probably never use. In a semi gun they were the bomb. But there's something cool about shooting a real FA MAC with the original GG mags that I like. But hey, I'm one of those MACaholic purists that sees any aftermarket mod to an Ingram as gross. LOL
Jak007

 

[Skunkbait]

I bought one Cobray 40 round magazine when I bought my Ingram M-10 .45 many years ago and was not at all satisfied with it. The magazine caused many failures to feed for some reason. I have always used modified M3 magazines and never had a problem with them.

 

[Abacab]

The 40rd mags were made by CMP in Atlanta. They were the brainchild of Wayne Daniel. When the open bolt semis were approved for sale by ATF, there was a sudden need for magazines. There were nowhere enough mags in 9mm or .380 to satisfy the perceived aftermarket demand. (The decision was made to ship guns with only one mag). Instead of just buying more cheap surplus Grease gun mags and modding them to fit, CMP produced a prototype 40rd mag. This was an extra 10rds and made for great marketing..."the ultimate in Ingram firepower" was the slogan. After the demise of RPB in 1982, they vanished.
While nowhere as robust as the GG mags, they were reliable. In the old days I shot thousands of rounds through them with no failures to remember. They were pricey, in the $30-40 price range. GG mags could be had for $5-7.
I still have 15 or 20 still in the plastic wrap that I'll probably never use. In a semi gun they were the bomb. But there's something cool about shooting a real FA MAC with the original GG mags that I like. But hey, I'm one of those MACaholic purists that sees any aftermarket mod to an Ingram as gross. LOL
Jak007

What was CMP? What was it an acronym for?

 

[Ericoak]

The 40rd mags were made by CMP in Atlanta. They were the brainchild of Wayne Daniel. When the open bolt semis were approved for sale by ATF, there was a sudden need for magazines. There were nowhere enough mags in 9mm or .380 to satisfy the perceived aftermarket demand. (The decision was made to ship guns with only one mag).
Jak007

What does 9mm or .380 magazine shortages have to do with .45 magazines?

 

[GUTTERRATT]

Cobray M10/45 40rd magazines are junk and they don't even hold 40rounds. I have a pouch set with 4 mags I'd be willing to sell if anybody is interested...

 

[BlackBelt]

What was CMP? What was it an acronym for?

Component Metal Products

 

[Sid T.]

Component Metal Products

That explains why they weren't listed at the Civilian Marksmanship Program website ;-)

 

[Jack007]

Cobray M10/45 40rd magazines are junk and they don't even hold 40rounds.

Well, I just grabbed three at random and they all held 40rds.
As far as being "junk", you know what they say about another man's treasure... LOL
I think you may have them sold already!
Jack

 

[GUTTERRATT]

Cobray M10/45 40rd magazines are junk and they don't even hold 40rounds. I have a pouch set with 4 mags I'd be willing to sell if anybody is interested...

(SPF)

 

[Jack007]

You're welcome, Gutter! LOL
Jack

 

[Bunker Hill]

I have a 4-pack of these as well and was never able to get them to feed reliably. Pop out the spring and you'll understand why. They did a great job of extending the magazine housing, but they didn't redesign the spring. They used a standard 30-round mag spring, thus the lack of effective spring pressure.