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The Heavy configuration's stock is capable of so many
adjustments, that it probably could be fitted to just anybody.
The LOP is adjustable by moving the stock from stop to stop, but
then the rubber butt pad can be worm-wheel adjusted as well,
to fill the in-between positions as needed. The stock also has a
comb that is adjustable in height (just loosen up the two Allen
screws with the attached multi-tool) and can be adjusted back
and forth. The Patrol Configuration stock is simpler, lighter,
smaller and the LOP adjustment is just like any AR-15 weapon
with a 6-position stock, similar to the selective-fire HK416/417.
In the Heavy Configuration the handguard covers almost the
whole length of the barrel – it reaches almost the rear edge
of the muzzle device, and has a special opening to change the
gas-regulator settings. Top MIL-STD-1913 rail extends over the
whole of the upper receiver, all the way to the front edge of
the handguard, while the side and bottom rails only reach the
traverse of the gas-regulator opening. With a top rail as long
as that, high-power optical sights are easily mounted – even
with NVD or TIR devices. In Patrol Configuration the handguard
with all rails terminate at the gas-regulator. The difference in
length between them is 2-3 gates at the most. In the Heavy
Configuration a Harris bipod is attached to the bottom rail as a
standard, but it can also be used for the Patrol version instead
of the Grip-Pod, which is a standard for that configuration.