If u go on amazone, u can buy dremel polishing felt cones that have the mandrel already on them to that will fit right inside the chamber of a 9 or 380. U can buy a dozen for 6.56$ beats the hell out opf dremels parts price.
Also a good buy is the dremel #520 polish wheel, felt in a mandrel that is impregnated with a compound that eliminates one using a polishing compound. tjhis is a really great peace guys, will polish ur feed ramp and chamber and anything, for $3.59.
Just sayin
probably most of u guys already know this to,.