>>64146829
>when is this beneficial in the field?
Anytime you're doing shit with your hands that doesnt directly involve the rifle. Popular with medics and the like.
>Isnt bcg weight on the SCAR and AR about the same
20.5oz vs 11.5oz on the 5.56 guns
On 7.62 ARs the carriers are heavy but DI 7.62 large frame guns always feel like shit to shoot.
>>64146836
SCAR has gas jets that function as a replaceable gas port on the rifle.
Above the gas jet is a gas regulator with coarse adjustments.
These two in combination let you tune the rifle to a given barrel length and ammunition choices, while still allowing the ability to switch between suppressed and unsuppressed usage.