A few years ago I studied screenshots of the Bronson film (the long shot where a guy is falling backwards with a long thin object pointing up. But it was suggested to me that the line was just a artifact or something. I had blown it up somewhat and it was quite grainy. I have files of those screenshots somewhere.
But that close with an AR-15? He would have surely really lost (his) face.
The "AR-15" is the back of Bennet's head.
[images lifted from patspeer.com] - "Debunking Donahue"
If you look at the Bronson film using certain "classified" filters you can see a cuckoo holding an AK-47 spring out of Ernie Brandt's hat.