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V
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elcome to a new
series looking at
upgrades, gadgets
and gizmos for your
weapons.
In this first article I will be fitting a
variable velocity device from SAT to a
standard Classic Army M4. The device
includes a replacement piston and piston
head (which can be adjusted to three
different power settings) as well as an
adjustment tool.
The VVD is designed to be installed
into V2 and V3 gearboxes but is not for
use with next-generation Tokyo Marui or
PSG-1 gearboxes or extended cylinders.
There are no actual fitting instructions
provided, although the VVD is a direct
replacement for your original piston and
shouldn’t present any major challenges.
However, unless you are confident in your
ability to strip and replace parts to your
weapon I would advise taking it to your
nearest repair agent.
The packaging has some very clear and
well-illustrated instructions on the actual
operation and adjustment of the device,
and once opened I found both the VVD
and adjusting tool to be of good quality
and construction.
The adjusting tool consists of a handle,
a set of six rods and
an end rod with
030
January 2012
New contributor Banzai gives us the lowdown
on fitting and using a variable velocity device
a squared end. The handle also doubles
up as a storage device for the rods, which
is a very good idea. The adjusting tool
does need to be assembled with slightly
more than finger pressure or it will undo
as you adjust the device. There are holes
in the rods so that you can insert a fine
screwdriver or allen key for this purpose.
So, onto the installation. First remove
the two main body pins, then the upper
receiver; after that remove the stock by
unscrewing the retaining screw (you will
need a long shank Phillips screwdriver).
Now remove the end cap from the pistol
grip (which covers the motor) and extract
the motor. Once this is done you will see
the two retaining screws which hold the
pistol grip in place – take these out and