Re: MOA BASE NEEDED FOR MY REM 40x 22?
In a pinch, you can always get one custom machined to whatever MOA you desire. IIRC 60 MOA is 1 degree.
I know that as of last check US Optics would do one for you, & they'd definitely know how to do the math to get the MOA right. That & I'm sure there are plenty of other folks out there who are handy with a Mill & a calculator. Likely a few well placed phone calls would yield what you're after, plus some expert advice.