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DuneShoot 02-06-2013 3:10 PM

How to limit 9mm AR Mags?
I'd like to limit some old (Metalform brand) 32 round 9mm AR mags to 10 rounds. I'd prefer it to be in a non-permanent way like a block or similar.

Anyone have a good way to do this? If not blocks, how else?

MadRiverArms 02-06-2013 3:18 PM

Are these modified Uzi magazines? If so then this is what you need:

Might work for other mags as well.

thedonger 02-06-2013 3:18 PM

If its not permanent its not a legal 10 rounder. You can use a block but you should pin the mag in some way.

DuneShoot 02-06-2013 3:27 PM

They are not UZI but the only difference is the notch. It says these can be epoxied and replace the floor plates.

If I pinned them with a rivet-where would be the best spot to drill?

MadRiverArms 02-06-2013 4:17 PM

Those mag blocks replace the original spring floorplate so if you disassemble them and rebuild without the block the outer floorplate will not stay in place. The mag will no longer be complete and most likely fall apart.

DuneShoot 02-06-2013 4:22 PM

Maybe I'm confused but isn't the floor plate the piece that sits inside the mag at the bottom of the spring? And if so if I ever removed the block I would reinstall the original floor plate?

cactus 02-07-2013 8:21 AM

Personaly I took a plastic coat hanger cut two peices that properly limit the capacity. I then hot glued them together and inserted them in the spring of the magazine. I then put a small tac weld but JB would work fine. It was a easy sollution and with the magazine indexed for 10 rounds and straight it was by far the easiest Ive ever modified. That and it was less than $1.oo. Good luck.

MadRiverArms 02-07-2013 9:11 AM

The thing that the spring attaches to is the floor plate retainer. It has a nub that sticks out through a hole in the floor plate and prevents it from sliding off the mag body under use. If you replace that with the block that also has a nub then the mag would be complete and the floor plate will not slide off under use. Removing the block and reassembling what is left (retainer not present) would be an incomplete magazine.

Don the savage 02-07-2013 9:34 AM


Originally Posted by MadRiverArms (Post 10446013)
Are these modified Uzi magazines? If so then this is what you need:

Might work for other mags as well.

Ive used the magblocks for 32 rounders and 20. Work great. The only way to go for blocking mags.

Sicarius 02-07-2013 9:52 AM

This is how I did mine.

I used a piece of all thread, 3 nuts, 2 washers, locktite and spot welded the floorplate though you can probably just epoxy it too.

I drilled out the take down dimple on the plate at the bottom of the spring. I used a piece of allthread and sandwiched the spring plate with the nuts and washers. I was able to then get the exact hight I needed for the allthread to bump against the follower. Once I got that, I locktited the threads on the plate. Now I put the baseplate and fed the extra bit of allthread through the hole on the baseplate. Put a washer on it and locktited a nut on that too. This way, the allthread is captured and won't touch the spring and if the nut gets removed, you are still limited to 10 rounds because the plate on the bottom of the spring is still holding the allthread.

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