BERT GRASSO
Match Rifle Rear Sight
The Bert Grasso Sight has a feature that operates like
the "Ladder" front sights. Notice the 6 vertical holes,
(3 in front of the knob and 3 behind the knob) in the base
of the sight mount. These holes represent "Pre-Determined" amounts
of changes needed to make the 'major' sight changes from 2-300 yards to
600 yards to 1000 yards. The shooter simply loosens the Knob, pull the
upper part of the assembly to the right and re-install the locator pins
in the desired holes for that particular yard line. To determine the location
of the holes, Bert used 168 gr. .308 @ 2600 fps for all the holes, except
for the 1000 yard holes. For those, he used 190 gr. .......load, which
he says is a 'Secret'! The "Windage" mechanism is designed to 'Float' to
the right and left as the knob is turned to make a windage change.
The 'Windage Screw' is threaded into the left side of
the sight mount and the 'Guide Pins' slide back and forth through this
block, as the screw is turned for windage changes. This means that when
you change your windage, the 'Width' of the Grasso Sight also changes.
The 'Guide Pins' and screw also come through the left side of the block,
but there is no interference noticed from this.
This view is to show the differences between the
3 sights when the windage is fully extended to the left. The Grasso
is the widest because of the 120 minutes of windage capability
and as noted before; the windage block moves on the pins through the left
mount. Rest assured that the Targets would be put away long before the
shooter needs 60 minutes of windage. This feature is so that
after you mount your Grasso Sight, the thickness of the sight base on the
rifle, will not create a shortage of windage movement. The
sight on the left is a # 2 and the sight on the right is a
PNW Mk I Proto-type. There will be up-dates on availability
and price of the Grasso Rear Sight. In the near future, I plan to have
a few tollerance test results posted between these 3 rear sights.
However, I do intend to wait for a 'Production PNW'. ...BOB JONES...
This View Shows The 3 Sights When Centered On Their Respective Windage Scales