Nice work on the slide cuts too.
I haven't gone down that road (yet), but I believe new Carry-Optics rules allow them?
How much weight reduction?
OEM weight is 40.5oz (I assume that includes mag.)
It's at 41.1oz right now with optic and empty mag. (No light.)
So only .6oz heavier than factory with a 2oz optic and a heavier stainless guide rod than the factory plastic one. Also I'm pretty sure the aluminum grips are about a half ounce heavier than the factory rubber ones as well.