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Yeah, I totally understand your point. If you're a good machinist, then you can probably pull this off. The PPK is probably your best bet, since it already starts as a modest BB gun, firing .177 @ about 320 FPS. A mod to fire lighter airsoft would probaby put that up pretty significantly, but possibly under 400 FPS, the limit allowed by most fields and CQB games.
As for the Px4, it shoots .177 pellets at 425 FPS, already above the 400 FPS limit. I fear throwing .20-.28g 6mm BBs would probably send that to over 500 FPS. At that point, there's other legal ramifications since it would be considered a firearm at that point.
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