I hate it when the author make huge mistakes involving firearms.
Most recently a books hero had bought a revolver on the street and the hard boiled cop told him to make sure he "switch on the safety" before he put it in his belt.
By the way, you cannot buy a modern, fully automatic, sub machine gun, with a silencer, at a gun store and walk out with it. Silencers are not completely silent. A shotgun blast will not make a grown man fly backwards six feet. A .44 mag will not blow a head clean off. An Uzi is empty in 1.5 seconds of continuous full auto fire. Recoil will not send a small shooter flying, even a small woman. You don't hear a hammer get manually back on a Glock 9mm. The slide locks open on a Glock when you are empty, no click, click on empty chambers.
--Writers, please do the research.