PA-63 is pleasing pistol to look at. It is essentially an enlarged Walther PP. In fact, some of the parts are a direct changout.
The Hungarians wanted them cheap and light for their police. So they went with the alloy frame and alodined them instead of anodizing. However, I have seem some in blak frame.
The drawback of the alloy frame is that it does not have the life expectancy of an all steel contruction. I have heard numbers of 1000 to 3000 rounds before the frame cracks. If you were in the Hungarian military, then you could get another when you needed one. For the collector, I can only suggest that you be careful and use only 95 gr mmo (no 105 gr - 120 gr stuff). Also, they tend to like FMJ as opposed to JHP.
As to the aweful trigger pull, I recommend polishing the mechanism and changing out the mainspring to about 11#. Replacements are available from Wolff Gunsprings. [Some people use a 9# spring, but I found that resulted in a lot of fail to fire.]
Also, the recoil spring should be replaced with a 15# from Wolff. That helps to reduce the shock of discharge.