That was definately not a DEVEL conversion. Devel conversions were offered in 3 different levels, the full house, the basic cut, and the function and reliability packages. All 3 had extra numbers added on to the end of the factory serial number, and had DEVEL red oval logos inlaid in the grips which this gun does not have, Also none of the DEVEL models have a checkered rear slide/frame as seen on this one. The work looks to be very well done. I'm sure it would be an excellent shooter. I have no guess as to who would have done this modification.