Unlike metal magazines, Thermold products won't jam because they're made with a nylon that resists heat, dirt and rust. Abuse them, drop them, throw them in the mud. They are dent resistant, self lubricating and non-corrosive.
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Submitted By: Harry R. On 12/18/2010
UPDATE: In my prior review I said that feeding was 'fine', but it appears now that it's not so great. I have an early model POI Carbon 15 that I've been working on, have it mostly running but it'll still stovepipe one or two rounds per magazine.
In working this problem, we realized that all the jams occur with the thermold 20 magazing. I've actually had a couple of stovepipes in my regular AR, and they occurred while using these thermolds. Never with a USGI or a C-mag.
As you can see in the picture, the feed lips are very long on these, the whole feed area is different than USGI.
Summary: In my first review, I rated these as good functioning with problems. That wasn't accurate, they're actually fair to poor functioning with problems. Plinking use only, not for serious endeavors.
[1 of 5 Stars]
Submitted By: Harry R. On 09/24/2010
These 20 round thermold magazines are very cheap, but are not garbage. Feeding is fine, but they do not catch the bolt after the last round, nor do they drop free of the weapon when you hit the magazine release. The followers are not anti-tilt, but I haven't had a problem with that yet.
I have an old thermold 30 round magazine that is absolutely top shelf, in my opinion as good as USGI in every way, so I was very disappointed in these. They'll be fine for the range, and are amazingly cheap, but they are not fully functional.
Feeding rounds = good
Catch bolt on last round = bad
Fall free when released = bad
Note: Is stamped 'LAW AND GOV'T USE ONLY', this could be a problem in some locations?
[3 of 5 Stars]