Can't help you with the part, but a 1957 ad for Savage 340 states,
"Model 340-S De Luxe is the same as Model 340 above except fitted with the following special equipment: Savage No. 175 Micro Peep Sight, disc elevator rear sight, Hooded Ramp Front Sight, fine checkering on grip and forearm, fitted with sling screw eyes for carrying strap."
Does your rifle have any of these other features?
