30 Round Seymour Magazine ?

[Bruce McAskill]

The commercially made 30 round magazines made here in the US are considered to be JUNK. The standard USGI magazines are the top of heap with the ones made in Korea number 2. They differ a bit from USGI in that they are just a little bit lighter in weight BUT they function very well. And of course they are cheaper to buy. Don't confuse then with the Chinese made junk.

Information

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[DaveHH]

Charlie covered maintenance well. I second the remark about slamming the magazine into the carbine. This behavior also wears out the nubs on the rear of the magazine. The magazines of this weapon are a wear item. I believe that this is why they were ordered by the millions.
Another contributor to poor magazine performance is cartridge length. This weapon has one serious fault, if the cartridge case is even a bit too long, the bolt does not fully engage the locking lugs and the carbine can explode. It was such a serious problem that ammunition manufacturers were required to check 100% of cases before completing the cartridge. With this in mind, if you reload this is important and the bullet must be seated at the proper depth. Cartridges with the bullet set too far out drag on the front of all magazines and interrupts the upward movement of the rounds in the magazine. It is perhaps the single biggest cause of jams when using reloads. The 30 round magazines are the most affected ones because of the bend.

[browningautorifle]

The standard USGI magazines are the top of heap

I made a point of using 15 rounders, USGI. No problems even with old ones.

The magazines of this weapon are a wear item. I believe that this is why they were ordered by the millions.

I got the idea somewhere that they were meant to be used once and discarded. Maybe it was the talk about them coming forward loaded from manufacture with caps on, used and dropped. Don't remember where I saw that.

if you reload this is important and the bullet must be seated at the proper depth.

Yes, trim and chamfer, all must be done. Then seating has to be checked. I never had trouble because of that. Others I know did.

[painter777]

I got the idea somewhere that they were meant to be used once and discarded. Maybe it was the talk about them coming forward loaded from manufacture with caps on, used and dropped. Don't remember where I saw that.

Read that myself BAR,
Earlier today while searching for the picture above I ran across a post about how many extra mags had to be supplied/made per carbine.
I'm still looking for that one, but did find this one:

https://www.milsurps.com/showthread.php?t=18969&

[painter777]

This is a Copy / Paste from a post by Bill Ricca from 2010. Thought this might be a good thread to post it back in to.

Bill Ricca:

Some marked fakes go back to more than 30 years ago.

Here is a list for the US collector:

Originals

A1
M2 (2 Variations)

AI (2 Variations)

K1
M2 (Hardback)

SEY (Hardback)

SEY (Welded)

J

J

Fakes with markings that are supposed to be US Contracts

SEY - Fake Welded
J - Fake Welded
UN (Never Existed) - Fake Welded
IU in Circle (Never Existed) -Fake Welded
AI - Fake Welded

A1
M2-Fake Welded

[INLAND44]

Another thing that will significantly affect function is if you are not using the special mag catch for the 30-rd mag.

[painter777]

will significantly affect function

I've watched guys bench shooting with their 15 and / or 30rd mag bottoms setting / resting on the bench. You can see the mags pivoting forward and backward as they're shooting. Mentioned this to one who was having feed issues.. he didn't want my opinion. Another listened and adjusted his rest so his magazine didn't contact the bench top and all other feeds went ok.
Sometimes it takes another set of eyes, you may not realize your doing it. Of course it may not cure the issue.
Worth trying to remember though. I realized I was doing it once, I think because I'd hung my targets so low. As I shot, the base plate had come loose and was walking backward off the tube. I don't think I'd of caught it until I was ready to re-pack that mag and seen the floor plate had walked nearly 1/2 way off the back of the tube.

Never to old to listen to a opinion. I've had fresh hires on their 2nd or 3rd day on the job with no real experience mention.... " have you every thought of XX" We'd look at each other, picture how is idea would layout and Damn if it wasn't something we'd never set up and his idea worked better than how we'd done it for years. Usually something with set up or rigging. I always figured no matter if you've done something the same general way for 30 years doesn't mean someone with less experience couldn't have a better idea for that particular move. Then again I've heard some crazy Sh!t from some. Always worth listening is my point.