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View Full Version : .458 SOCOM Magazine - Legal Question


CycloSteve
01-12-2011, 3:18 AM
Currently I am looking at options for a feral pig hunting upper/caliber and one option out there is the .458 SOCOM, which can be used with a standard AR multi-caliber lower platform.

According to the designer of the .458, Marty ter Weeme of Teppo Jutsu LLC:

The .458 SOCOM was designed to work with any GI/Mil Spec magazine. We have not heard of any particular type or brand of magazine that did not function. Magazine capacities for the different size magazines are as follows:


10 rounds of .223 = 3 rounds of .458 SOCOM
20 rounds of .223 = 7 rounds of .458 SOCOM
30 rounds of .223 = 10 rounds of .458 SOCOM
40 rounds of .223 = 13 rounds of .458 SOCOM

So, would we legally in California be limited to using a 10 round AR magazine and only be able to fit three .458's, or would we somehow be able to use a standard 20 or 30 round magazine so that seven or 10 rounds of .458 could be loaded? I could see the need for more than three rounds while hunting.

If we could use the 20 or 30 round magazines for .458's, and we also own a standard 5.56 upper, could this get us into hot water since the magazines are capable of holding more than 10 5.56 rounds?

Not looking for a debate on any merits of this caliber vs. others, just some thoughts on the magazine capacity question.

nrakid88
01-12-2011, 3:31 AM
I don't know mag legalities too well, but 458 socom is the bee's knees

Purple K
01-12-2011, 3:35 AM
I own AR platform rifles chambered in .223, 6.8spc and .450 bushmaster. All of the magazines are interchangeable. I can put more than ten rounds of .223/5.56 into either the 6.8 or .450 magazines and get myself into trouble. To keep that from happening I've clearly labeled all the magazines to indicate which rifle they're intended to fit. The same potential exists for certain handguns that are of the same family. Certain 9mm, 10mm and .40 magazines will physically fit into the handgun, those designed to hold ten-rounds of one caliber may hold 11 or 12 of another. Very difficult to prosecute

CycloSteve
01-12-2011, 4:10 AM
I own AR platform rifles chambered in .223, 6.8spc and .450 bushmaster. All of the magazines are interchangeable. I can put more than ten rounds of .223/5.56 into either the 6.8 or .450 magazines and get myself into trouble. To keep that from happening I've clearly labeled all the magazines to indicate which rifle they're intended to fit. The same potential exists for certain handguns that are of the same family. Certain 9mm, 10mm and .40 magazines will physically fit into the handgun, those designed to hold ten-rounds of one caliber may hold 11 or 12 of another. Very difficult to prosecute

I agree, labeling does make sense and could help ones' case.

Do the 6.8spc and .450 Bushy use the same mags as a standard AR?

With some of the other examples I am not sure if they would function/feed, ie loading 12 rounds of 9mm into a Glock 10mm/.40 magazine. As an example, I am sure that I can jam plenty of 22 rimfire into almost any magazine, yet it is not a functioning magazine for any firearm at that point as the rounds will not feed.

The oddball with this setup is that both the 5.56 and .458 use the same magazine, and thus function and feed properly in the rifle (with the different uppers of course). Magpuls (my prefered brand) clearly come labeled with 5.56x45 on the side. My concern is that an LEO and then Prosecuter perhaps could say that even if you relabeled, and only had .458s while you were hunting that you were breaking the law because you had a high-cap mag in your rifle (bullet button one), as it was designed for 20 or 30 rounds of 5.56, and could be used as such.

OleCuss
01-12-2011, 4:17 AM
So far as I know, you can legally purchase a 10 round .458 SOCOM magazine in California.

The fact that it would also function as a 30 round 5.56 magazine would seem to be immaterial.

So if you want to use a 10 round .458 SOCOM magazine, why not just buy one? Make sure that the thing is marked as a .458 SOCOM mag and you'll be fine.

Now if you also happen to have a featureless AR-15 chambered in 5.56mm, you could have the happy circumstance wherein if you are not using that magazine for your .458 that day, you could use it as a 30 round magazine in your 5.56mm. You could also use it in a RAW (if you happened to have one). Please note that this is perfectly legal since you did not manufacture or import a 30 round magazine at all.

So just buy a couple of 10 round .458 SOCOM magazines and be happy! Just make sure they are clearly labeled for .458 SOCOM.

CycloSteve
01-12-2011, 4:58 AM
Not sure why I didn't find these earlier in my "search", but they do bring up the whole debate.

http://www.calguns.net/calgunforum/showthread.php?t=89786&page=2

http://www.calguns.net/calgunforum/showthread.php?t=78765&highlight=458+socom+mags

jtmkinsd
01-12-2011, 10:27 AM
Not sure why I didn't find these earlier in my "search", but they do bring up the whole debate.

http://www.calguns.net/calgunforum/showthread.php?t=89786&page=2

http://www.calguns.net/calgunforum/showthread.php?t=78765&highlight=458+socom+mags

You don't need any special markings, tape, or pink paint. But you will have to grind a notch in the front of the .223 mag to facilitate the feed on the .458 round.

Librarian
01-12-2011, 11:02 AM
The basic principal is buy 10-round (or fewer) magazines and use them in the appropriate weapons.

After that, it is not illegal to own, possess or use a large-capacity magazine.

Asked and answered.