Reach for the Sky, Mister!

Reach for the Sky, Mister! is an unmarked quest in Fallout: New Vegas.

Quick walkthrough
Upon entering Freeside through the Freeside's East Gate, you will see a boy chasing a girl. The boy, Max, is holding a unique weapon in his hand, Euclid's C-Finder.

To get the gun from Max, the player has some options. Order him to give it to you or (if you have the Child at Heart perk) make up a nice story so you can get it that way. You can also buy it for a 1,000 caps or with enough Barter skill, bargain it down to 20 caps.

It is also possible to obtain multiple copies of Euclid's C-Finder, by coming back to Max every few weeks and talking to him, you will see him equip a new version of Euclid's C-Finder, which you can buy from him again. It is also thought that, for every version of Euclid's C-Finder you have, you get another ARCHII Charge, allowing you to seemingly get infinite ARCHII Charges.

Detailed walkthrough

 * After walking through freeside you will eventually activate the quest. (usually near Mick and Ralph's)
 * Max will be chasing a girl named Stacy with Euclid's C-Finder.
 * Talk to him and he will say "Reach for the sky, mister/Lady!" Ask him how much for the toy.
 * He will say "Sorry I need it to shoot Stacy with", then he will say how he paid 1 million caps for it and it is not even brand new.
 * By paying 1000 caps for it he will give you it, OR with your barter skill high enough (45) you can buy it for 20.