Htshot,
I just bought a P1 and this advice was left for me over on "the high road":
"The P-38/P1 ejects to the LEFT and you may get an occasional case bounced off your head.
Otherwise, NO hot ammo, or heavy bullets.
These guns were designed to work with 125 grain ammo, and will work nicely with 115 grain, STANDARD LOAD. Again, no hotter ammo or heavier bullets.
Also, no "heavy-duty" springs.
Hot ammo and/or heavier springs will cause frame and slide cracks.
Do not remove the slide cover unless you have NO choice. It's easy to spring or mis-assemble, and will blow off, scattering parts.
Other than that, the P1 is a fun to shoot gun."