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Israeli HP question

1606 5
New guy here with a question on my Israeli HP a got last summer form AIM.

I finally got to shoot it last week and I couldn't hit paper with it! I was out about 25' and I hit the paper once out of 8 shots. Now, I'm an OK shot cause I tool out my Kimber 45 CDP and put 6 shots in a 4" group at the same distance. So I moved closer, 15 feet. Same thing! Now two rounds out of 8 hit the paper. What can through off the sights so much? Any suggestion? I didn't do anything to the gun except clean, load and shoot. All shots went off with no FTF or FTE. And I have read that some have gotten MK II and other MK III. How do you tell the difference?