Unfortunately Glock proper is very unhappy with the Airsoft world so it is harder to get quality Glock clones into the US. Do you happen to know which brand of Airsoft Glock you did purchase? I do know that KWA has the "ATP" which is their work around on the Glock copyrights. I should fit all non-custom molded Kydex holsters. It does not however have the "exact" shape of a Glock (some even claim it feels a little better). But they are easily purchasable in the US (provided KWA has them in stock) and the other benefit is that KWA is based in California so they can be refurbished/repaired as needed.
Brands that look exactly like a Glock that I would trust are Tokyo Marui (non-metal slide) and KSC (be sure to look for the ones with the metal slide). I know WE Tech has been making a TM clone but I have never held one so I can not comment on the quality of the pistol.
