Could an executive order be issued in regard to what happened in Orlando?

[still_one]

20. "At the Orlando shooting, more than 20 rounds can be heard being fired in rapid succession"

AR-15s, which were first developed for the military and used extensively in the Vietnam War, are widely owned by assault-rifle enthusiasts. The rifle, which can rapidly fire multiple high-velocity rounds, has been used in a number of mass shootings, including those in Aurora, Colo.; Newtown, Conn.; and San Bernardino, Calif.

The rifle is legal to buy in most states, including Florida. In 1994, Congress passed an assault weapons ban, which expired in 2004, that prohibited manufacturing the AR-15 for civilian sale with large-capacity magazines, bayonets or pistol grips.

In a video taken by a bystander at the Orlando shooting, more than 20 rounds can be heard being fired in rapid succession. Like most states, Florida does not restrict the capacity of magazines. State bans have been ineffective: purchasers can cross state lines and AR-15s with limited-capacity magazines can easily be modified to accept larger magazines. The shooters in San Bernardino used high-capacity magazines despite California’s ban on semiautomatic rifles with magazines of more than 10 bullets.

http://www.nytimes.com/interactive/2016/06/12/us/why-the-orlando-shooting-was-so-deadly.html