Honestly, with kit lenses that old, you would be much, much better off to get a native EF-M IS 18-150 STM lens that is a better optic. These early lenses have not got the STM motor drives on the EF-M lenses that are both faster to focus and allow focusing without switching to MF on the lens. The native lenses are far more compact and will balance much better on the M50 body. There are also 15-45, 18-55 and 55-200 lenses EF-M lenses available and you can likely pick them up second hand at a decent price.
The 75-300 was never a good lens optically and has not got image stabilization which is significant for longer lenses. If you need longer reach than the EF-M lenses, then the EF IS USM 70-300 f/4.5 5.6 MkI or MkII lenses offer image stabilization, far better build and optics and work well with the adapter that John recommended.
cheers, TREVOR
The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
