I found these 2 sources that might help you to set a price. One is out of stock (and is a 9 round magazine) and the other doesn't have any bids as of yet. I hope this helps.

https://www.gunbroker.com/item/886977977

https://gunmagwarehouse.com/colt-sporter-ar-15-223-5-56-9-round-aluminum-magazine.html




Last edited by turbine1; 01/23/21.
turbine1
Life Member of the NRA
Only two defining forces have ever offered to die for you. 1. Jesus Christ 2. The American G.I "One died for your soul, the other for your freedom!" You might want to pass this on, as many seem to forget both of them!