In the Season 3 finale of Reacher, Jack Reacher chooses a Mossberg 500 Persuader shotgun.
Reacher's shotgun is an Easter egg for the original book upon which Season 3 is based, Lee Child's 2003 novel Persuader.
The shotgun was chosen for its lightweight and close-range capabilities, aligning with Reacher's desire to take out his enemy without causing collateral damage.
Reacher gets his revenge on Quinn using the same weapon whose name inspired the story.