I was at a gun show today and someone had Glock Mags labeled as "Glock Asian Military" ?? There were metal, drop free, hi-cap @ $23/each any caliber. What the heck are they? Will they work well? He also had standard capacity factory Glock Mags at $23 as well. Again, any caliber for any Glock same price. Do these prices sound good? Anything I should look for when I go back in the morning?