I have several 20 round Colt magazines, marked "AR15", which were given to me by a buddy who had them since the early 80s.  They work fine, but I much prefer 30s, for the simple fact that they hold 10 more rounds and are pretty much just as easy to store and tote around.

So I'm thinking of putting them on the EE for trade.  Are the Colt marked mags worth any more than, say, an Okay or Sanchez?  In other words, should I be looking for more than an even trade?

I don't wanna be greedy, but don't wanna be a fool, either.  Thanks.