Drew up a list of all the gun parts in chapter 14 and went through them again.
One last time.
No really, I can quit anytime. I'm not addicted.
It was the Full Zoom Scope in the main chapter.
The collectible video starts here, and my orinentation's great, I know where this is instantly. All previous times I see the weapon part and think "Well, no fucking way I missed that." and turned it off before the message flashed up on screen. This time I didn't. Revelations followed. You beauty.
New bitch: The Dig Deep Suit is nearly identical to the Flight Suit. :/