There all over the capital wasteland. You have to look for them. Try looking for them in desks, cabinets, dressers, metal boxes, as well as safes. (safes is more a rarity but always be sure to look)
No, you can only craft, find or buy the dart gun in Fallout 3.
There is a railway rifle that shoots railroad spikes, and you get that gun from blueprints (look on YouTube for a guide to find them). There is also a Guess rifle from the DLC Operation Anchorage that shoots a laser similar to a real rail-gun (just smaller) and you get that gun from just playing the DLC.
There are two ways, one is you can go to a power station (forget which one) and you can get a schematics and build it yourself. Or you can go to a "random encounter" area and you will meet a guy by himself with a railway gun, he will attack you.
at home depot or lowes
There is a railway rifle that shoots railroad spikes, and you get that gun from blueprints (look on youtube for a guide to find them). There is also a Guess rifle from the DLC Operation Anchorage that shoots a laser similar to a real rail-gun (just smaller) and you get that gun from just playing the DLC.
potassium nitrate, charcoal, sulfur.
alien blaster but ammo is hard to find after you have it all and its at the alien crash site
Bullets.
Fallout New Vegas is a role playing game.There are several powerful weapons available to find or to buy.The Sniper Rifle is one of the better weapons.
Worst Gun on Fallout 3The worst gun on Fallout 3 would probably be the toy knife from point lookout.a toy knife is not a gun i would say the 10mm pistol or the .32 pistol either one of them they are not powerful and they suck point blank period. cannabiscup last edit
All around best gun for me would be 'This Machine'.
The FatMan you are talking about is the MIRV. It's in the national guard depot, and to get in you will need to find all of the Kellar family chronicles.