He's new. I'll fix it for him.That would work better if you got the title right. TUNER, no "R".
Thanks manThere are a few folks around here who may have the knowledge to help you. I'm familiar with (as in, I've at least seen and touched) the Harrels but I've never used one.
I'm seriously considering putting some sort of tuner on a 7.62x39 build but that's a whole 'nother subject.
Good luck.