Here is a link I found to a site selling a book that covers LORCIN pistol disassembly/assembly, or so iot claims. I know nothing about the site or its reliability, but the book is only $5.00. Maybe it will tell you how to get it done without a hitch.
Sad thing,man when guys just won't spend an extra $75 and get a used Browning Buckmark .22, or a Star BM 9mm. They obviously aint gonna PRACTICE enough with a centerfire, if even $300 to them. That's at most 6 month's practice with the centerfire pistol. Sheesh. Better get a better job, or quit blowing money on crap that doesn't matter any.
If he's proficient with his Lorcin, then he LEARNED on something else, cause getting and staying good with a centerfire pistol takes many thousands of rds, and a Lorcin will never stand up to that much shooting. Most people's idea of "proficient" is pathetic, that's all.