Obligatory, "Out the shop"There's lots of prebans for sale around here if you look around. Just saw a Gen2 G17 with 5 preban mags for sale for $250 at a pawn shop.
Carrying 30 year old plastic mags in a carry gun is simply a bad idea. I'll take a 10 rounder that definitely works over a 17 rounder that might work any day.