Matt Damon says it will be clear to audiences the next installment of his Bourne film franchise takes place in a "post-Snowden" world.

Damon is to start production on his fourth movie as Jason Bourne next month. The film is due out in July 2016.

Damon last played the globe-trotting spy in the 2007 blockbuster The Bourne Ultimatum.

"Without giving too much of it away, it's Bourne through an austerity-riddled Europe and in a post-Snowden world," Damon said, referring to Edward Snowden, the National Security Agency leaker, while talking to BuzzFeed about the next installment in the Bourne saga.

"It seems like enough has changed, you know? There are all these kinds of arguments about spying and civil liberties and the nature of democracy."

That just means that it's one of the Glock 17s used on the movie. There's always at least a double, and sometimes a triple or a quadruple, for every "hero" gun use. The reason being that if a weapon malfunctions on-set, or gets damaged in some way, they can't stall the entire production just to fix the gun. However, sometimes the guns aren't 100% identical to each other, even though they're meant to be used as a single character's weapon; it's likely that this was the case here. The armorer probably just grabbed several Glock 17s off the rack, and some of them had the standard sights, while others had the night sights. But all of them could have been used on-set.
Source: UPI