Nice post 18DAI! I recently was lucky enough to also acquire a 4516-3, though unfortunately it hasn't made a trip to the range yet. I'm hoping to get it there soon but my schedule has been hectic lately.

I will say that it has a very smooth trigger and makes a nice companion piece to my 4506 (R4), which also has the laser markings, MIM components, and no 'dash' listed after the model number. That 4506 is a real sweetheart to shoot, and no doubt more accurate than I am!