I just finished putting togeth my scope and set up on my HS HTR. First off the screws I got with the IOR base were the wrong diameter and thread for the HS reciever. It took me 2 weeks to get the right ones. Then they didn't fit the base(I should have thought of this) So I drilled out the holes in the base. After that I see that the screws are all 11mm and the length needed is different for each hole in the base since it is tapered. finally everything was right. I even found a 30mm steel bar that I could use to settle the rings out with. I mounted it in the rings and gave it a few taps with a plastic mallet. After that I took it out and mounted the scope. Leveled the rifle with a bubble and leveled the crosshairs on a plumb line. It looks like everything is in perfect order. So tomorrow I will be spending the day at the range with my new toy, it's been 6 months since I got the rifle, 2 weeks since I got the scope... As you can appreciate I am pretty keep to get some rounds down the barrel. I'll be sure to post the results as tomorrow night. Good shooting to the rest of you for the weekend.