I came across this today: Thermold 20rd mag for $4.99 http://www.centerfiresystems.com/magar-ther-20.aspx 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?