The NCPD alert will not show up until you kill the organized crime Russian mobsters just a bit south, where you will pick up the Buzzsaw crafting spec. When you do go to this NCPD location, Tom Ayer, the enemy that drops it, is the mantis blade wielder. You need to get him to pull out his rifle, by attacking at range. If you kill him while he is wielding his rifle, Psalm 11:6 crafting spec should drop.
As far as I can tell, no bug, just many are killing him while he is fighting them with the mantis blades, which means it will not drop. Bad design, but easy to work around now that you know.