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Posted: 12/10/2016 12:07:34 PM EDT
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Here are the Portuguese AR-10 mag photos and the Brownells SR-25 mag photos that I could not upload to my original thread on these mags.
The Portuguese mag. Attached File The un-modified Brownells AR-10 mag Attached File The modified Brownells AR-10 mag Attached File The over insertion tabs on the Portuguese AR-10 mag feed lips Hmmmm... The internet does not like me today, I'll come back later and try to edit this post to add the picture of the Portuguese AR-10 over insertion tabs. |
| I do not have any tightness. Your photo indicates the need for a little more tweeking. The most important part of cold setting the insertion bump is blocking/shimming the inside of the mag body. A piece of plate, a few HSS tooling blanks and a feeler gauge or two to get it tight works very well. When I modified mine I tried several strategies to get it completely flat, oxy/act torch and a vise grip, then a vise, finally cold with a 1" brass drift and a bmfh worked the best. This method was actually the least damaging, by only making the park shinny at the contact point, it also very effective flattening AR15 20s to fit prototype lowers. |
| The way I do mine is to take a DPMS steel .308 magazine and use a Dremel tool with a thin cutting wheel (these are the thin ones that come 20 per tube) and I cut the mag slot all the way to the right (on medium to high speed) and stop at the edge of the magazine. I do this on top and of course on the bottom extending both to the edge. Then I just bend the newly created tab up and bend it back and forth until it comes off and the file out the rough spots. The Dremel makes a big difference and saves time. I then pound down the mag stop with a large diameter punch and hammer until it is flush with the mag body. Mine fit and function perfect and they drop free as well as hold the bolt open. Use the steel DPMS magazine and it will work great for you. |
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