I'm having a tad of trouble with the DAZ-Desert Eagle (at the moment), but I've noticed the same bubbling effect shown in the gun picture included in other renders of mine. Usually weapons. 
Actually always weapons, or more specifically guns. MP5 does the same thing sometimes and several other handguns also. 
Ok after previewing the thread I'm now posting here at renderosity for help, I'm noticing that the file size skewing renderosity.com/forums does for bandwidth purposes I'm assuming,  isnt showing the distortion like my renders I make show. Lemme try another angle to show it more betta...