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DIY Ruger Scout Mag conversion to M5 AICS type BM (Rem 700 shown)

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Gunny Sergeant
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Minuteman
Jul 19, 2008
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SCRANTON AREA PENNSYLVANIA
New bottom metal on your rifle, AICS mag style, is an excellent option to add. The "drawback" if you want to call it that is the price of magazines, especially if you want to have a few preloaded and ready for use. There is no doubt a quality magazine for use in matches or while hunting is paramount for reliability, but for general range use you can easily spend a lot of dough quickly.

There are many threads concerning if the Ruger Scout Rifle poly magazine will work, it will not in it's unmodified state. I do not know about the Ruger metal magazines, however as the metal ones are about the same price as the already known to work offerings, might as well stick to the regular magazines by Alpha, Accurate, AICS, etc.

Enter the Ruger poly magazine - very affordable ($30.00 - $35.00 at the time of this writing), and being of a synthetic material it's easy to modify to fit the AICS style bottom metal using sandpaper, a file, or preferably a rotary power tool of some sort.

First a quick look at the Ruger 10 round magazine, a very sturdy piece with plenty of gripping "girth" and recessed areas on it to improve grip. The mag also comes with a dust cover. Shown below compared to an Alpha metal magazine. The Ruger is a stagger feed, just like the Alpha which makes it shorter than other mags, and it's just a little longer than the Alpha by about a measly 1/8". The biggest part of the modification is the magazine "lips" on top, note the difference between the two:




Trying the mag in the well before any modifications, it will only go so far. The biggest hangup stopping it are the ridges that fully run around the sides of the mag, that was the first thing that had to be sanded down. At first I though going to the highest ridge to the top would do it, however on the 10 rounder, the ridges on the sides have to be sanded down to the middle ridge. The top ridge has to be sanded flush with the body of the mag on the front and back, and just the raised parts on the side to the middle ridge. Be extremely careful not to sand through the magazine body.



Now it will be able to be moved in more. Not fully seated in the picture, there is still some interference with the feed ramp and lips.



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So now we get to the "lips" of the magazine, again a few comparison pictures. Bump up the lips of the usual mag to that of the Ruger, mark with a pencil the area that has to be trimmed off to mimic the profile of the regular mag.



As there will be plenty of debris, wear safety glasses / goggles, and remove the follower (easily done by poking in the button on the bottom of the mag plate, then slide the plate off, remove the spring and follower. Using a rotary tool with a router type bit, I simply cut away the area shaded with the pencil. Use the contour of the recessed area toward the front of the mag to get the proper angle. Follow up with a sandpaper wheel, and a Scotch brite pad to help take off the burrs. Interestingly, the med / large sanding wheel is just the right size to open up the round contour on the front to mate with your feed ramp.



How far to sand for the feed ramp? You can keep fitting it in the well to ensure a good fit. It wasn't until I was finished that I realized the dust cover can be put on and used as an almost perfect template to make the rounded area for the feed ramp.



Still some light sanding with a high grit paper for a finished project, but here it is loaded with ammo. The shell is at 2.800", there is some room for longer OAL, but not much more. I would have to believe that a groove could be fashioned on the inside of the front of the mag if needed.



A few more comparisons to the Alpha mag after the modification.



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A comparison of the Ruger mag before and after trimming the lips.



A few pictures of how the mag, ammo, bolt, and feed ramp mate up. At first there was a little resistance while the bolt stripped off the round, but using a piece of sandpaper around an empty round on the inside of the lips made the transition smooth as glass. No other feeding or extraction problems. When fully loaded, the mag does swell a little, you may have to sand the sides a little more.



Finally, a comparison of how much the Ruger mag protrudes out of the bottom metal. The modified Ruger mag is only 1/8" or less longer than the Alpha.



The fit is better than I thought, the release positively engages the nipple or catch on the back of the mag and is further supported against the feed ramp. With a little more care put into the sanding effort, most of the rattling can be minimized, though you'll run the risk of a too tight fit when the mag swells while being fully loaded. After several runs at the range, the mag stays seated - no issues, and rattles no more than the Alpha mag does. I don't know if the lips can be sanded back more, but as it functions as is i didn't try to "improve" it any.

An added plus is that the dust cover is still functional on a fully loaded or empty mag, and for just a few bucks over the cost of one regular 10 round mag, you can get 2 Rugers to modify and use. No denting out of shape or rusting either.

The first mag I did (taking care the first time around) took about 50 min, including picture taking, the next two mags took a little under 15 minutes each, IMO, time well spent.

After removing the follower & bottom plate, hand sanding with 120 grit sandpaper and another pass with the Scotch brite pad, removed sanding dust and cleaned with acetone, 2 coats of Ace hardware BBQ paint and a view of the finished product:

 
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Nice breakdown on fixing up the polymer mags.

Metal Ruger Scout mags fit and function in my McRee chassis. Accurate-mag is the OEM for the Ruger Scout magazines (stamped on the mag body). I have a couple from Ruger, and the finishes vary, the most recent I picked up has a better finish.
 
Should have posted this originally, a look after cleaning dust off and wiping with acetone, 2 coats of Ace hardware BBQ paint (with followers and bottom plate removed) and a view of the finished product.