Lofty,
Nothing at all wrong with the G-43. A tad bigger than my Ruger LCP but it is a Glock and pretty much says it all.

A far a spare parts go,I don't think that any are really needed.

I have a Model 36 that after untold rounds,the slide stop lever spring broke. Less than a week at Glock and it was back in my hands pretty much new.....no charge.

What ever your choice may be,it is the best choice for you.

Wayne