4chan is full of posts about the CEO's killer today. They say from the video it looks like that gun. If it's true, the killer can't be an amateur. This is a rare historical gun, average people don't know about it.
I noticed I posted this previously but that the book was split up into two volumes and I only posted one of them, and it's a book (or books) that might be something to look at for the coming new year. There are 53 lessons with sub-lessons under them about various spiritual topics.
This was recommended for spiritual reading in "My Prayer Book" by Fr. Lasance (early 1900s): https://archive.org/details/MyPrayerBookHappinessInGoodness