Protip: WE's are generally a straight Mauri clone (with metal components instead of plastic). If it works for Mauri it tends to work for WE. The only exception is their 1911's. They're a bit different in the mags.
I would defer to someone very knowledgeable in gas pistols before plunking down a large wad of cash on any of this. Check with Exarach. He knows his gas pistols inside and out.