This raises an interesting (if only theoretical for me) question. With aftermarket frames (Lone Wolf, all metal) and aftermarket slides (Lone Wolf, Caspian), and aftermarket barrles (too many to mention), and aftermarket versions of most of the small parts (triggers, strikers, mag releases, slide stops, slide locks, etc.) it's theoretically possible to build a "Glock-compatible" pistol using few if any actual Glock parts. Would such a beast be legal in UL/Masters? When does a "modified" Glock cease to be a Glock?