Its been surprisingly reliable. PSP actually made Baby Brownings for sale in Europe under license from FN.
Mec-gar magazine's are excellent. The design is 120 years old and still works for me.
I keep it clean and oiled. It's 30 years old and still looks like new. .25 acp is comparable to a .22 power wise, but more reliable IMO because it's a center fire.
Consider replacing the recoil spring if it is old. Good magazine's are a necessity
Fun gun, super tiny! Sights are more of a suggestion than anything else, but this piece wasn’t meant for target shooting. Precision Small Arms is keeping the design alive and they even make a threaded barrel for it.