Originally Posted By CarlosC:


The P6 was indeed a single stack. It was the Police version of the P225 and had a few differences that distinguish it from the 225. Off the top of my head, the mainspring was -I believe- 24lb, much heavier than the 225. Secondly, the unusual hammer with the cutout to indicate if the gun had been dropped on the hammer and possibly damaged. It was an easy visual mark if the spur was either bent or broken. Finally, the feed ramp profile is different, up to a certain year, because the P6s were only intended to use FMJ. So, those with the FMJ barrels may have difficulty chambering hollow points.
The "P" designation was the adoption code used by the Germany to indicate formal adoption by either military or police, if my memory serves me right. It numerically followed the Walther P5 and preceded the HK P7. The post-war version of the P-38 started it all as the P1.

The P6 and P225 use the same magazines, which are incredibly expensive (~ $75) for some reason. The newer version of the P225, the A or A1 (same thing), uses a newly-designed, non-interchangeable magazine that is much more reasonable in cost (~$35).