Savage Flatback Receiver (2003 and older):
Receiver is rounded on front of receiver and flat on back of receiver where mounts attach.
Base screws are 6-48 X 1/4" long and ring screws are 6-40 X 5/8" long. Both screws use a 7/64" Allen wrench.
Short action - Outside to outside of rings is 4.36". Standard rings are .63" wide and have 2 ring screws per ring. 4 Hole to hole spacing dimensions are .86", 3.94", .86". Height of mounts from top of receiver to centerline of scope tube is - low .92", medium 1.05", and high 1.17".
Long action - Outside to outside of rings is 5.06". Standard rings are .63" wide and have 2 ring screws per ring. 4 Hole to hole spacing dimensions are .86", 4.63", .86". Height of mounts from top of receiver to centerline of scope tube is - low .92", medium 1.05", and high 1.17".