Barrage used to cause Pinning by default, and as yet
FW haven't updated the rules for the Quad Launcher to include the pinning rule since 7th.
Has come up in previous threads, and someone usually provides an email from
FW stating that it's meant to have pinning, and that they're going to
FAQ it
"soon".
However, from the standpoint of this forum that doesn't mean much (
Tenet number 2).
RAW the rule does nothing,
HIWPI is that it's meant to have Pinning.