More than 30,000 people will be killed this year in the USA alone. They will be killed by automobiles. When someone is killed by a negligent driver no one asks what make of car was he driving? No one asks what was the model of phone he found more important than paying attention to the road. It is the driver who was guilty, not the automobile.
And yet, if there is a shooting incident such as that recently in Florida the media are fascinated by what model of gun the shooter used. It is not the gun that is the problem! Gun control laws are not the solution! Gun control laws victimize the law-abiding and create an illusion of a solution when nothing has actually been achieved.
The gun did not cause the man to murder. Religious intolerance and institutionalized homophobia did. Poor security let him take these actions with little real opposition. Mass shootings occur because their targets are undefended and irrelevant and unnecessary laws are accepted as action rather than addressing this.
What model of gun he used or whether it had a pistol grip is not relevant. By concentrating on such irrelevancies you are only perpetuating the problem and preventing a real solution.