Are the Olympics where you can handle them? if so take a couple of random mags out of your mag stash and go check them in the weapons to see if they drop out easily, sometimes Olys can have this problem. would I buy another preban oly, yes...specifically to built a 9mm rifle, dont have to worry about the magwell then.
What kind of coating is on the Tec 9, Blued ones are all over the place. I have a Stainless one, i have not seen another Stainless at a gunshow in a long time, but always see the blued ones....If anyone sees or has a barrel extension in the Stainless, let me know, I want it. The price does not seem to far off for a preban, if it is in real good condition, what extras does it come with? if you just want a Tec 9, and the preban is not a big deal, check out castle arms, they have the postban versions real cheap.