Vortex Optics VIPER PST 1-4X24 RIFLESCOPE - Manual (Page 7)

AR-style rifles will usually require an extra-high mounting height on a
specialized cantilever-style mount such as the Vortex ADR-X cantilever
ring mount (shown above).
13 12
RIFLESCOPE
r
ifleSco pe
m
ounTing
To get the best performance from your Vortex Viper PST riflescope,
proper mounting is
essential. Although not
difficult, the correct
steps must be followed.
If you are unsure of your
abilities, it would be best
to use the services of a
qualified gunsmith.
Centering of the Reticle
The Vortex Viper PST riflescope is pre-set from the factory with the reticle
in the center of the adjustment ranges.
1. Turn the windage or elevation dial as far as possible in either direction.
Do not force the dial. As soon as any resistance is felt, stop turning.
2. Carefully count the dial rotations while turning the dial back in the
opposite direction. Stop turning as soon as resistance is felt.
3. Turn the dial the other direction to half the amount of rotations
counted in step one.
If you have changed the settings and wish to approximately reset the reticle
to the center, this can be done easily:
Complete this procedure for both windage and elevation dials to
approximately center the reticle
.
Rings and Bases
Mount an appropriate base and matching rings to your rifle according
to the manufacturer’s instructions. The Vortex Viper PST riflescopes
require 30 mm rings.
Ring height for Viper PST 1–4x24 riflescopes will depend on the firearm
and mount being used. Consult the ring and base manufacturer for
suggested heights..
Use 30 mm rings.