Chop saw or miter saw? I think you asked about a chop saw but the advice so far is for miter saws.
The main question was about A chop saw that can do miter cuts. Or a miter saw thats made for cutting metal I guess . And I asked as a secondary question if I'm going to be buying a used miter saw for wood what are some things I need to look at before buying it.
if you buy used , you need to make sure it cuts square , does it cut the angles correctly , are all the guards and parts present and in good order, will it turn to 45 then return to 0 and be square does the brake work most saws now slow down quickly with an electric brake that comes on when the trigger is released older saws and some that are damaged the blade free spins for several seconds after letting off the trigger.
expect replacing the blade
how big of work will you need to cut
there are 10 and 12 inch miter saws there are also sliding saws that let you cut larger pieces
is it metal or wood you will be cutting ?
if you buy a rigid , register it the day you get it , you get like 30 days but as your taking it out of the box register it , guess who forgot to register it , I have broken parts on 2 rigid tools and those are the only 2 I didn't register.
most saws have a clamp option , you can grab a piece of scrap and clamp it down to make the measurement stop so you can cut a bunch of the same size piece
the warning with those it make sure to blow the saw dust away every few or it ca build up and effect your measurement