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Posted: 1/26/2015 2:43:00 PM EDT
I picked one of these up last week for $7 when I was in the local surplus store. I liked the thick texture on the outside and thought I would give one a try. I don't think it will even make it in a gun. While I was sitting in the truck earlier I unloaded a GI mag and loaded up this MSAR with about a dozen rounds. The lips flexed outwards so bad I could not get the rounds to stay in. It spit almost all 12 rounds out 2-3 at a time just while I was holding it. I looked closer and saw the feed lips bowing real wide. I guess it is going in the trash.
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I had 6 before they went to the new style. They would work for about 2 mags then they would start pushing the rounds though the front of the mag. I dumped them in the trash at a shoot and the owner of the placed called me up to tell me I left my mags. I told him to rty them.
He called me back the next day and said "oh, I see what you mean". No idea on the new mags. too many others that work for a good price. |
| I got some from CDNN a while back that came with my Colt. I used them at a recent range day and didn't have any issue with them. I intentionally left one of the 40rd and about 3 of the 30rd mags loaded for months before I hit the range. Fed fine in my Colt - even the 40 rounder. Mine are the black versions, not the smoke. The smoke versions look like they are made out of a different plastic. Looks like it's harder and I equated harder with more brittle so I didn't buy those. I've used my spoon and strippers on them with no issues. If I drop a mag from about 3 feet on the carpet I will loose a round or two though. They also seem to drop free with no issues. I'll continue to use them at the range to see if I have any failures from them. |
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Quoted:
"Low moisture absorbtion" I figured that was just an inherent property of .... um.... pretty much every polymer. No actually it's not. For exampled, the black polymer most mags are made of is Glass Reinforced Nylon. Nylon not only absorbs up to 2.5% of it's weight in water, the water also acts as a plasticizer to Nylon making it less rigid. As the Nylon absorbs water it grows in size. Some guys report mags not dropping free in super humid environments with Nylon mags because of the swelling. So, a plastic that does not absorb or react with water is a good thing as far as mags are concerned. |
| Several friends and I were given one each as samples to test out at a LE show a few years ago. They seemed to feed fine but didn't drop free and several, including mine, cracked at the back of the feed lips. I wasn't impressed and stopped using it. I'm not sure it I tossed it or still have it around. |
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Quoted:
No actually it's not. For exampled, the black polymer most mags are made of is Glass Reinforced Nylon. Nylon not only absorbs up to 2.5% of it's weight in water, the water also acts as a plasticizer to Nylon making it less rigid. As the Nylon absorbs water it grows in size. Some guys report mags not dropping free in super humid environments with Nylon mags because of the swelling. So, a plastic that does not absorb or react with water is a good thing as far as mags are concerned. Quoted:
Quoted:
"Low moisture absorbtion" I figured that was just an inherent property of .... um.... pretty much every polymer. No actually it's not. For exampled, the black polymer most mags are made of is Glass Reinforced Nylon. Nylon not only absorbs up to 2.5% of it's weight in water, the water also acts as a plasticizer to Nylon making it less rigid. As the Nylon absorbs water it grows in size. Some guys report mags not dropping free in super humid environments with Nylon mags because of the swelling. So, a plastic that does not absorb or react with water is a good thing as far as mags are concerned. well I'll be damned. |
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well I'll be damned. Quoted:
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Quoted:
"Low moisture absorbtion" I figured that was just an inherent property of .... um.... pretty much every polymer. No actually it's not. For exampled, the black polymer most mags are made of is Glass Reinforced Nylon. Nylon not only absorbs up to 2.5% of it's weight in water, the water also acts as a plasticizer to Nylon making it less rigid. As the Nylon absorbs water it grows in size. Some guys report mags not dropping free in super humid environments with Nylon mags because of the swelling. So, a plastic that does not absorb or react with water is a good thing as far as mags are concerned. well I'll be damned. Did not know that, half tempted to leave a magazine body (no springs or metal bits) in a bucket of water for a couple weeks to see what happens. |
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Quoted:
Did not know that, half tempted to leave a magazine body (no springs or metal bits) in a bucket of water for a couple weeks to see what happens. Quoted:
Quoted:
Quoted:
Quoted:
"Low moisture absorbtion" I figured that was just an inherent property of .... um.... pretty much every polymer. No actually it's not. For exampled, the black polymer most mags are made of is Glass Reinforced Nylon. Nylon not only absorbs up to 2.5% of it's weight in water, the water also acts as a plasticizer to Nylon making it less rigid. As the Nylon absorbs water it grows in size. Some guys report mags not dropping free in super humid environments with Nylon mags because of the swelling. So, a plastic that does not absorb or react with water is a good thing as far as mags are concerned. well I'll be damned. Did not know that, half tempted to leave a magazine body (no springs or metal bits) in a bucket of water for a couple weeks to see what happens. If it's made of nylon, you should notice it being more flexible. Also, if you had a sensitive enough scale, you would see the weight gain. 
These were the reasons we wanted to make sure our mag material was not hygroscopic. The down side is that you can't dye our mags different colors.... |
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