The Fastest Way To Convert Aluminum 5.56 AR Magazines For Use With .50 Beowulf

Back in 2018, I documented how to convert a basic aluminum AR magazine using a Dremel and a small drum. With the new Alpha ‘Wulf build, I made four new ones real fast using a slightly new method.

With the Alexander Arms (AA) .50 Beowulf DIY Upper comes one actual Beowulf magazine built to AA’s specifications by E-Lander Magazines of Israel. This gave me a chance to see what they did differently to support the ‘Wulf and it comes down to a relief in the front of the otherwise normal AR magazine. This allows the shoulder of the cartridge to pass by without hanging up on its way towards the chamber. Everything else appeared the same in terms of the feed lips and the follower.

E-Lander of Israel makes the Beowulf magazines for Alexander Arms. One is included with the DIY Upper Kit.
This is the top front of the E-Lander magazine. Note the notched out area. On a normal AR magazinet his goes straight across,

So, armed with how basic this was, it immediately hit me that a flap sander could make a quick angled surface faster than the drum mag. So, I loaded up a 3/8″ 120 grit flap sander with a 1/8″ shank into my bench rotary tool.

The first step is to remove the floor plate of the magazine. On these D&H magazines from PSA, I just use a screw driver to lift the floor plate for the tabs to clear the magazine body. Pull the floor plate off while trapping the magazine spring. Remove the floor plate, spring and follower so they are out of your way.

I slide a small screw driver between the magazine body and the bottom plate to then lift and remove the plate from the magazine. Note, the magazine spring will come fling out.
See the tabs/ridges stamped in the floor plate? That is why you need to use the screw driver to lift the plate so those tabs can clear the magazine body.
Any rotary too will use. This is my benchmounted unit that I use on grips and what not, Any Dremel or other rotary tool would work.

So you basically use the flap sander to to cut a ramp on the inside edge of the magazine. You do not need to replicate the notch – just use the flap sander to quickly remove the material.

The left magazine is an original unmodified magazine. The middle has the ramp cut and the right unit has been reassembled. Be sure to blow out the mags before reassembly.

Using the flap sander can get the job done in 30 seconds or so – it’s literally that fast. Be sure to blow out the magazine bodies to remove all of the grit before you reassemble them. Failure to do so may cause you problems later either with the magazine failing or getting into the rifle.

The final step is to test each magazine to make sure it feeds properly. Load two rounds to test chambering in a safe place with the muzzle pointed in a safe direction. Never take a risk.

That’s all there is to it. You can convert a magazine faster than the time it took you to read this post. I hope it helps you out.


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