I just returned from my neighbor's range, trying out my vortex Viper red dot on my 4516-1.
This is actually the first I've shot this pistol.
WOW, what a fantastic shooting pistol !!!
As compared to my CZ po9 9 mm to me the 4516-1 has less felt recoil and less muzzle flip.
I am extremely pleased with how this pistol handled during slow fire and fastfire. Standing From 7 to 15 yards all shots within in a 6 inch circle. I couldn't ask for more. But will probably tighten the groups after much more practice. Double thumbs up on this pistol.

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2 Cor 5:17
John3:16