BSA Optics TW4X20 - Manual (Page 3)

Hold the scope and look through the eye piece at a flat, featureless, well lit
area. The reticle should appear sharp and well defined. To make adjustments
rotate the ocular bell focus ring in either direction. Look through the scope
again. If the focus of the reticle has improved but is not perfect, continue
to rotate in the same direct. If the condition has worsened, you will need to
rotate the bell in the opposite direction. Lock the eyepiece firmly by using the
focus locking ring.
CAUTION:
BE SURE THAT THE FIREARM IS NOT LOADED.
PRACTICE SAFE FIREARM HANDLING AT ALL TIMES.
2.) MOUNTING
The TW4X20 Tactical Weapon™ scopes quick detachable mount fits all
AR style carry handle upper receivers.
• Remove the threaded mounting clip.
• Position the extended threaded screw through the hole on top of
the AR handle.
• The threaded clip is then reinstalled beneath the base of the handle.
• Turn clip as far clockwise to tighten. Check to make sure the reticle
is aligned both vertically and horizontally with the bore axes of the
firearm.
CAUTION:
BE SURE THAT THE FIREARM IS NOT LOADED.
PRACTICE SAFE FIREARM HANDLING AT ALL TIMES.
3.) PRE-ZEROING
Locate an appropriate location to fire your rifle and set up a target at a
distance of 100 yards* from your shooting location. You should use a
comfortable gun rest to eliminate as much human error as possible. Make
certain the rifle is empty with no cartridge in the chamber and the breech
open. The TW4X20 has a 50 yard parallax and standard focus knob.
Manual Adjustment: To adjust windage, remove the turret cover and make
adjustments with coin or fitted flat head screwdriver. Rotate the elevation
knob to 1 (X100 Yards). The elevation knob has a coin style cover, remove and
make adjustment. *Once zeroed, you can adjust for ballistic compensation
from 100 to 500 yards.
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