I am considering purchasing a BSA Sweet .22 3-9 x 40 mm objective rifle scope for my 1970 Glenfield Marlin Model 60 with the 2 grooves milled into the top of the receiver (this rifle is not drilled & tapped for bases) and would appreciate some feedback. I have already ordered an inexpensive set of Leupold Rifleman .22 RF 3/8" detachable See-Thru Rings, Model # 57323, from Brownells. Does anyone know if this combination will work and will the scope's 40 mm objective have enough clearance without having to remove the rear factory sight? Any advice?