Vortex Optics VIPER PST 1-4X24 RIFLESCOPE - Manual (Page 6)

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RIFLESCOPE
Customizable Rotational Stop (CRS)
Vortex Viper PST riflescope elevation turrets incorporate the unique
CRS rotation stop feature. After the rifle is sighted in, the design of the
CRS allows a shooter to quickly and easily return to an original zero
point when using the elevation turret to dial-in temporary bullet drop
corrections.
The CRS feature is particularly useful when dialing large multi-
revolution elevation corrections. Without this feature, the shooter
must pay very careful attention when dialing these large corrections.
If the shooter loses track of the number of revolutions, the original
zero point may become lost when returning the adjustment.
Viper PST
riflescopes equipped with the CRS allow the elevation dial to be quickly
spun back to original zero without having to carefully count revolutions
or clicks.
Once the CRS shims are installed after sight-in, the elevation dial will
stop turning shortly past the original zero point when being returned
(turning clockwise direction) from a temporary elevation adjustment.
The shooter can then turn the elevation knob a partial turn in a
counter-clockwise direction until the zero reference and radius bar are
correctly aligned—achieving the original zero point.
See CRS shim installation in the
Bore Sighting and Final Range
Sight-in sections.
CRS Shims
Turret Rotation
Vortex Viper PST riflescopes incorporate Vortex’s patented Radius Bar
to visually assist in keeping track
of turret rotations. The radius
bar provides a quick visual
reference that allows the shooter
to confirm:
• Knob orientation is correct
and has not shifted as a result of
accidental contact.
• Knob orientation is at the
zero point when using the CRS
feature.
• By watching the position of
the bar while making elevation adjustments, the shooter is able to quickly
track full, half and quarter rotations.
To get these benefits from the Radius Bar, the “0” mark on the turret must
be indexed with the zero reference line on turret post (see Setting the
CRS Stop and Indexing Elevation Knob section on page 17).
Zero Reference Lines
Radius Bar
Turret Cap
Retaining
Screw