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Littlepoopers 01-06-2010 03:55 PM

Carbine magazine catches
Hears a dumb question for you. How do I tell if my Carbine will hold a 30 rd. Magazine?

E-7Ret. 01-06-2010 04:15 PM

The Magazine catch will have a capital M with a line under it denoting an M2 Catch. M2 Carbines were the only ones originally designed to operate with a 30-round magazine. The catch has a small nub that supports the magazine.

BQ97 01-06-2010 04:49 PM

Any magazine catch will work with 30 round magazines as long as the catch and nubs on the magazine are in good condition.

They type IV magazine catch will have a leg on the left side to correspond with the additional nub on the USGI 30 round magazines. Latter production type IV magazine catches won't have an underlined M.

BTW there is no such thing as an M2 magazine catch as it is not part of the M2 kit. Once the type IV catch was standardized it was used in production on M1 and M2 carbines alike.

mar53 01-06-2010 05:16 PM

I have used 30 round magazines with the older 15 round mag catches and they do work. I have never tried however, a FULL 30 rounds. The theory is that the magazine will be unstable due to the weight, without the Type 4 catch, that is why they designed the new catches.

DaveHH 01-06-2010 06:46 PM

I've used the 30s with the older style catch a lot
I finally decided that the carbine is much lighter and easy to handle with 15s and stopped using 30s. I believe that on full automatic fire the late catch helps to hold everything together. This is not an issue with M1 carbines. I will say that my 30s are USGI AI splits and SEY bardback. The 15s just are better all around with the exception of the follower.

E-7Ret. 01-06-2010 08:11 PM

W15a Magazine catch, M2, M marked,

Direct from Bill Ricca's website. I'll take his word.

BQ97 01-06-2010 09:46 PM

You can call it a '57 Chevy if you like but that doesn't make it one. The Ordnance Dept referred to it as a magazine catch, 7161842 rev 4 or 5. It was suitable for use on all carbines not just M2s.

Bill Ricca 01-07-2010 06:14 AM

You have to click on the History of Markings on my carbine web page to see the entire description. As BQ shows there were non M marked mag catches. The only US GI contract was in 1969, if I recall. (I would have to check my records to see if there was one in the 1952-53 era, I don't recall.)

There was also a West German one made circa 1958-59.

Littlepoopers 01-07-2010 11:54 AM

Thanks all for the replies. BQ97 your picture was worth 1000 words. My latch is the new # 5 it has the nub but no letter M on the thumb tab.

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