Which parts to replace ?

[ZX-10R]

Hello Guys,

Every once in a while I just have to shoot my matching '36 S/42.
Not much ( 10 to 15 rounds of S&B Subsonic) and not very often, about 10 times per year.
Of course I do not wish to damage any numbered parts, so I would like to replace some parts for new ones.
So my question is ; which parts would you replace for shooting a matching numbered pistol ? And which parts are most likely to fail or break whilst shooting ?

I know I shouldn't shoot it, i've tried to make it a safequeen, but I just can't.....