I have been struggling with reliability problems on my Para P-13. The result of the diagnosis is that it stems from the magazines...in particular, the dimensions of the feed lip opening were too wide, which resulted in periodic failures to feed.
In measuring my magazines, I found that ALL of my P-13 magazines measured between 0.420" - 0.448". By comparison, all of my P-14 magazines were much closer to 0.400" (0.396-0.407).
I was able to test fire using my P-14 mags and a borrowed 10 round P-13 mag which had an opening around 0.400"....problem solved, no more FTF problems.
I was told by Para that there should be no difference between the openings for a P-14 mag and a P-13 mad....yet I find it very strange that ALL my P-14 mags (>10) measured around 0.400" and ALL my P-13 mags (>10) were closer to 4.30".
I've just returned the mags to Para to try and sort out this issue, but it got me wondering if I am just unlucky to get all my mags out of spec.....
Any of you care to measure the openings in your P-13 mags and share what you find?