My dad has two glock 21 10 round mags he's wanting to sell. Not sure if it makes a difference they are Clinton ban era mags. Finding a price? Everywhere I've seen is out of stock. What's a good price to ask.
And I saw heaven opened, and behold a white horse; and he that sat upon him was called Faithful and True, and in righteousness he doth judge and make war.
The point of pre ban mags is that they they high capacity. I believe 13 is standard for the 21. If not hi cap people want the newer mags. You may be able to get $25-$30 for them. Best to keep them with the gun.