Mind if I try to flesh it out...
You are working late in an industrial strip mall in a relatively remote cornerof the city. While taking some stuff out to the dumpster out back, you notice some sort of commotion between a pair of parked cars about 30 meters away. You decide to carefully investigate, and happen upon a rape being perpetrated upon a female by three males. Just about the time you recognize the situation, one of them notices you, when you are about 15 meters away. He yells something in a foreign language, and then two of them charge you, they each appear to have bladed weapons. Since your hand was already on your weapon, and you were still 40 feet away, you draw as you shout a warning. They continue, and you quickly put two rounds into each perps chest. You notice in the streetlight that they have MS 13 tattoos.
Then things go sideways.
Shouts towards the buildings beyond them notify you that there were more in the alleyway further down which you didn't notice.
Situation: no less than 8 individuals, some with guns, some with machetes are about 30 meters away, and starting to run and raise weapons. There is one perp very close to you (10 meters distance) on the ground. You realize will need to stop at your works back entrance to unlock the door, which will take a good 7 seconds to dig the keys ourt of your jeans, find the right one on the ring of 30 keys, get it into the lock, unlock, and get inside, which is just too damned long. Your car/truck parked on the other side of the strip (75 meters long total) is about 30 meters from the front door of the establishment, pointed towards it. Inside is an SKS in a gun rack with a few stripper clips in the glove compartment, but nothing in the weapon.
It's 30 meters to the dumpster, and 15 more to the corner of the strip mall. the strip mall is 20 meters wide, and a featureless wall on the end.
No; you are not working at a gun store; you are working at an engraving shop, or some other place which would not have weapons readily available.
Okay; you just dropped two MS13 gangsters, and their 8 friends are pissed, armed, and drawing down.