Here's a Gunbroker auction for some 20-round Colt preban AR mags:
http://www.gunbroker.com/Auction/ViewItem.asp?Item=84225303
There are no bids as of right now!
http://www.gunbroker.com/Auction/ViewItem.asp?Item=84225303
Colt AR15 M16 20rd USGI Preban Magazines NEW!
$24.00 each
(Last six I have left) You are bidding on new unused Preban factory Colt M16 20 round M16 AR15 USGI issue magazines. These mags are in new condition and have never had a round in them. These are factory Colt UI magazines with the alloy followers and were manufactured in the late 1960's and early 1970's. They have the USGI markings and are preban magazines. Some finish wear from being in storage for almost 40 years but new and unused. This is a Dutch auction so one bid = one mag. Bid on whatever quanity you want. Shipping will be $7.00 for the first mag and 0.75 for each thereafter. I will not ship to any state that cannot own hi-cap magazines. If you live in one of these states please do not bid. If you live in a state that allows Pre 1994 Hi-Caps or live in a free state then bid away! I only ship to CONN US only. SORRY NO PAYPAL!
There are no bids as of right now!