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 Magazine Malfunction!
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Junior Member

53 Posts

Posted - 07/20/2016 :  12:08:33 AM  Show Profile Send Kilibreaux a Private Message  Reply with Quote
Okay here is my experience so far:

OEM 10 round mag that came with my New Production Inland ILM-140 is only marginally functional.

Bought some "10/15" blocked KCI mags from Jestic Arms (blocked to 10 round to be legal in Kalifornia). These to my surprise have worked VERY well!

Now comes the problem...bought three "10/30" round mags from Fulton Armory. The mags LOOK great and came with M2 followers. At $40 a pop I expected them to work pretty well, but such has not been the case.

During feeding, the LEFT round feeds perfectly and smoothly.
The RIGHT round kicks up and over to jam the bullet nose into the LEFT side of the chamber mouth!
When manually pushing rounds out, the LEFT side remains in contact with the left side feed lip as the case slides forward.
The RIGHT side appears to have little more than the rim section in contact with the right feed lip.
Also, the second-to-last round is the RIGHT side and the rim hangs on the M2 follower!

So, the mags feed 100% off the left side, and jam 100% off the right side!

The metal appears substantial and properly tempered, but that right side geometry is off.

MY thinking is the right side fed lip needs to be reshaped slightly "down/in" to apply more contact to the case as well as prevent the cartridge being levered up and sideways too early in the feed stroke.

Any other thoughts? And I don't need to hear just toss them aside, throw them away, or palm them off on some other unsuspecting person. If ANY magazines can feed 100%, then ALL can feed 100% when properly tuned...so I want to hear from those who have invested themselves in working with mags to make them work!

Senior Member

764 Posts

Posted - 07/20/2016 :  07:35:21 AM  Show Profile Send swampmolly a Private Message  Reply with Quote
You can test the adjustment of the front lips, by holding a loaded magazine with both hands and stripping out live rounds by hand. They should pop straight up when the rear of the round passes the cut outs in the center of the magazine. If the round continues past the cut outs, then the lip needs to be adjusted outward slightly until it pops straight up as it just passes the cutouts.
I made a bender by cutting a steel rod with a hacksaw 1/2 way through and place on the lip.
Good luck and don't go crazy bending the lips. Baby steps.
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3335 Posts

Posted - 07/20/2016 :  10:00:23 AM  Show Profile Send Tuna a Private Message  Reply with Quote
You have discovered that a magazine made in the USA for the most part are junk and it's sad to say but true. I have yet to find any commercial 30 round magazine made here that works period. So one that is blocked to 10 rounds is not likely to work any better then the 30 round version. As swampmolly said you can carefully bending the lips but it's not a 100% fix all the time. So as he said take your time doing it and good luck with it.
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