I wish I had seen this sooner. I have an M77 and put Leupold mounts on mine. They are made specifically for Ruger's integral mounting base. These mounts use Torx screws and are VERY well made. Much better than factory Ruger mounts IMHO.
They mate nicely with my Leupold scope.
"This, this you can trust..."
Glock 23 - Glock 19 - S&W 629 Mountain Gun - S&W 442 Centennial - Taurus 689 - Bushmaster XM15 E2S 20" HBAR - Ruger M77 MK II - Marlin 336 - Browning BPS 12 ga. 3 1/2 inch - need lots more!