Mallosi grading question

hi all
ok i think my 172 kit is graded a it has an a on the piston crown but also looks like an m

the barrell has an a with some code numbers on it also on the bottom of it
so is it an a grade ?

as i need new rings which would be the best ones to get as they go in 2thou increases

many thanks


here. [;)]

Checked an old SIP catalog, and A,B,C, & H rings all have the same nr!

the rings have most likely the same dimensions exept for the end gap.
No reason or gain for using other then „a“ rings to an „a“ piston.