I have a P1, with a slide date of 9/82. It included all the various upgrades made in design over the years including the hex bolt. And yes, the frame cracked, even though I never shot anything but standard ammo thru it. The crack was small and hard to find so I suspect the previous owner (it was a consignment piece) might have used high power stuff, discovered the crack, and unloaded the gun - my bad luck. Despite that, I would buy another one if I found a good one but only because I like the design, it's a cheap piece of history, it's smooth operating and generally fun. But I would not consider it for concealed carry. Simply put there are much better choices, guns that are smaller, larger capacity, and don't have the ammo limitations. My P1 also had a tendency to eject straight back which caused some hot moments in undesired locations.
FWIW - Most P1s are sold with two magazines and a police style holster. My P1 never had a problem w/ basic jhp, specifically WWB from Wal-Mart
FYI - regards the hex bolt in a P1 frame. The hex bolt does not reinforce the frame the way most people think. If you examine how the P1 operates, the steel hex bolt keeps the steel locking block from peening the softer aluminum frame when the slide returns to battery after being fired. Over the years the design received upgrades in response to improved ammo such as stronger recoil springs, and heavier slides, hence the need for the bolt to prevent peening the frame. Today, some owners try to put in even heavier duty recoil springs to handle the high powered ammo, but this puts too much stress on the frame both firing and returning to battery. In effect, the frame gets more hammered both coming and going. According to the folks at the p38forum, even older design P1s will shoot fine provided you don't try to use high powered ammo. The best reason for buying a P1 with the hex bolt is simply because it indicates a later production issue and will likely include all the various design upgrades made over the years.