The Regulator and Deregulator actually start out as the same knife, the Deregulator was created (well, modded) in response to some members of the Test Team chewing up the top gaurd of the Res-C when using the TT-Regs for batoning. The TT-Reg and the Reg/Dereg have different grinds. The Original Test Team Regs came with a Full Height Grind, whereas the Reg and Dereg are Saber Grind. Other than the Deregulator having the milled top gaurd, the mil-overrun knives are the same design.

Seth- IIRC, didn't you have a slight size disparity with a couple of your Regs/Deregs? like one blade being slightly shorter than another?