This has already been done, actually. One of them was for sale in the classified section a couple of weeks ago. Apparently some Asian company is retooling the Umarex PPK pistols for airsoft use
http://www.airsoftcanada.com/attachm...6&d=1195368776
My only real question about this gun though is the magazine. How does one fit 6mm BBs in a stick mag that has an outer measurement of 6x8mm?
And BTW, I have that PPK BB .177 gun and it's an awesome little gun.
Now. If you could somehow modify the Umarex Beretta Px4 Storm pistol for airsoft BBs, I'd have an orgasm on the spot and order 10 of them.