Had Kirby drill/tap the receiver for #8 - I'll never use #6 again. My Leupold torx kit has only 8-40 .278" - which worked fine for the back three screws (which might be OK until I get a short front screw). I put a #6-48 .210" in the hole just to check for length - and it was too long. Where can I order #8 torx screws without paying $5 each? Thanks to the help on my Savage post I got the correct base in the mail today (Kirby is sending one just in case I had ordered the wrong part) BTW, I was going to put my NighForce 8-32x56 BR with NP-R2 on it - but after reading Don's story I think I'll install the loopy 4.5-14x50 until I get the right screw and Burris Xtreme rings.