Nice answer from DaFRABRICATA I never thought of that before.
PM9 you must me a Kahr fan, I use to have a P9 with trits and the barrel/hood bead blasted and polished for silky smooth action. I sold that weapon and regret it more then anything else I have ever sold or traded.
Anyway welcome to CPF and if I may ask what took you so long to post?