Is restricting gun access a part of the solution to mass shooting incidents in the U.S.?

An example of a mass shooting incident may be the June 12, 2016 terrorist attack occurred inside Pulse, a gay nightclub in Orlando, Florida, United States, using legally purchased high-capacity firearms. Fifty people died including the gunman, who was killed by Orlando police after a three-hour standoff. An additional 53 people were injured. It was the deadliest mass shooting by a single gunman and the deadliest incident of violence against LGBT people in U.S. history, and also the deadliest terrorist attack in the U.S. since the September 11 attacks in 2001. [source]

If the gun control was stricter in Orlando, how different would it be?