Thermold AR Mags

[gnarkill]

I came across this today:
Thermold 20rd mag for $4.99
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Has anyone used these? A quick google search shows them getting good reviews except for the canadian version which seemed to have melting problems. I read that the all american ones, which these have the USA stamp on them, are great. I am thinking for 5 bucks each I almost have to order a few. What are your guys' thoughts on these?

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[MrNiceGuy]

A friend of mine had a few. While using them we had feeding issues.
I cant say for certain that the magazines were the problem, but it sure seemed to be the only aggravating factor.
Personally, i'd rather have one good 30 round mag than 3 iffy 20 rounders.