If you achieved 7 wins in Trials of Osiris but didn't receive the Adept version of The Inquisitor shotgun, it's likely due to the current reward structure. As of recent updates, Adept weapons are primarily awarded upon reaching the Lighthouse with a Flawless Passage (7-0 record). While there have been changes allowing for additional chances at Adept drops based on win streaks and team composition, these are not guaranteed. For instance, achieving a three-win streak or completing matches as a full fireteam can increase your chances, but the highest probability comes from a Flawless run.