John Jovino made the Effector guns. Among other mods, the barrels were shortened as much as they could while still retaining the ejector rod latch. I've never seen an L-frame version only N-frames, interesting. Jovino guns are top quality customs and pretty hard to find.
ETA: If you google "jovino 686 effector" you'll find a few links, most of which are to this forum. Apparently Jovino made a few of them, you're quite lucky to have found that one. Where'd you find it? What kind of deal did you get?
FYI, that tritium insert in the front sight is not original.