FN Service Bulletin: FNS Family of Pistols
FN recently became aware of a condition found within the FNS family of pistols that, under a very limited and unlikely set of circumstances, could cause the pistol to delay fire after the trigger is initially pulled. This condition can only be replicated in FNS pistols manufactured before February 12, 2017.
To our knowledge, this delayed-fire condition has only occurred in controlled testing environments; FN has not received any reports of delayed fire in the field under these unusual circumstances.