The FBI has released footage of the U.S. Navy Yard spree killer. [Make the jump or click here for CNN’s version with commentary.] Lots to learn from a small amount of tape, even though the Fibbies withheld the bang-bang. For example, does that count as a sawed-off shotgun? Looks like a stock Remington 870 with the stock cut off to me. And a Prius-driving spree killer? There goes the ‘right wing nutcase’ meme, right? Other observations: Alexis’s target acquisition technique looks casual, to say the least. Just goes to show how much luck—or not—is involved in mass shootings. The FBI’s takeaway: “Alexis had no specific target.” Click here for an FBI photo gallery of images from the security video and more close-ups of the Remington. Also revealed: another message etched into the top of the barrel. “End to the torment!” And just the beginning for the survivors and victims’ friends and relatives . . .