Can’t speak for the m16 but the g14 was stupid easy. Didn’t even need a pry tool, the bottom right screw lifted the back cover up for you.

I had a 2019 Msi stealth gs65 (15.6”) from 2019 until just a couple months ago. Amazing build quality. All metal. No hinge issues. Traveled the country with it constantly.

Never had a single issue. Sold it after 3 years of use for half my money back.