Location: Gibson Scrap Yard
You can only get this weapon by killing Old Lady Gibson. If you decide to kill her, your karma will decrease. It is up to you to decide if you feel as if this shotgun is worth it with its stats.
Also be warned that if you decide to kill her, you may want to complete the Side Quest called Nothin But A Hound Dog if you plan on wanting the attack damage versus either increased speed or increased toughness then you will need to keep Old Lady Gibson alive till afterwards.
You cannot get it by sneaking and pickpocketing it from her, or any other way.
Location: The Thorn, in the sewers in front of Westside
Do not be mistaken that this weapon is at the Old Nuclear Test Site because it is not. The weapon located there is just a regular Hunting Shotgun and not the unique shotgun here called the Dinner Bell.
You will need to talk to Red Lucy inside of The Thorn which is located right in front of the entrance to Westside. She will give you a Side Quest called Bleed Me Dry which will be quite a long quest.
You will need to collect all of the following to complete this quest for Red Lucy: Radscorpion Eggs, Fire Gecko Eggs, Night Stalker Eggs, Cazador Eggs and finally Deathclaw Eggs.
When you finished collecting them all, after giving her the Deathclaw Eggs you will receive this unique weapon Dinner Bell from her.
This Machine: (M1 Garand)
Location: Camp McCarran
This weapon is a reward by the Contreras if you do not turn him in. It will be at the end of the free quest titled Dealing with Contreras.
Gobi Campaign Scout Rifle:
Location: Snipers Nest
This weapon will be inside of a footlocker in the Snipers Nest that overlooks the Cottonwood Cove. It is nearly all the way up the hill.
Location: Sunset Sarsaparilla Billboard; North of El Dorado Gas & Service
If you decide to kill him, you should know that if you do you will fail the Side Quest Talent Pool. Talent Pool is also an achievement worth 20 Gamerscore or a Bronze Trophy. To start the Talent Pool Side Quest talk to Tommy Torini at the Tops Casino and go from there.
Once you are done with the Side Quest you can kill him, or before if it does not matter to you or if you already have the achievement or trophy. You will not be able to pickpocket him to get the weapon. He will give you his gun at the end of the Side Quest.
However; one final way you can get his weapon without doing the side quest or killing him would be to shoot the gun out of his hand which can be done by carefully shooting him so he draws his weapon.
La Longue Carabine:
Location: Camp McCarran
You will need to kill Corporal Sterling in order to acquire this sniper rifle from him.
If you choose to kill him, NCR infamy will be gained. If you do not wish to be shunned from the NCR then you cannot kill him which is the only way you can get his weapon as it cannot be pickpocketed.
Location: Primm at The Bison Steve Hotel
You will need a lockpick skill of 75 in order to get in this vault. The vault is located in the floor behind the cash register of the Gift Shop.
If you do not have a lockpick skill of 75 you will need to either rank up until you do or find and use the skill magazine called Locksmiths Reader that temporary gives you +20 to your lockpick skill. You would still need at least a lockpick skill of 55 though if you had only 1. There are 12 of these.
You could also search for Skill Books which permanently increase these skills. Find the 4 locations to Thumbers Today Skill Books to increase your skill by +3 (or +4 with the Comprehension Perk) each time you find and use the book.
Location: Vault 34
This weapon will be on the floor on an turned table inside of the Armory Cache in Vault 34.
Location: Broc Flower Cave
This weapon will be against a desk inside of the Broc Flower Cave.
Maria: (golden 9mm pistol)
Location: The Tops Casino
This weapon can only be acquired if you kill Benny. Once you have, take it off his body.
Location: Novac at the Dino Bite Gift Shop.
You can either buy this weapon here, or pick the lock to the storage room and steal it from there.
Location: The Devils Throat
This weapon will be inside The Devils Throat at the back of the container trailer by a dead body.
Vance's Submachine Gun:
Location: Wins Hideout
You will find Vances 9mm Submachine Gun inside of his safe in his shack. His shack is to the northwest of the Vegas Strip North Gate, North of Vegas and right down the street from H&H Tools Factory.
You will need a lockpick skill of 100 in order to be able to open the safe. You can use either a skill book to increase your lockpick skill by 3 for each of the 4 in the game or you can find skill magazines which will temporary increase your skill by 20 for each magazine to be able to open it.
Abilene Kid LE BB Gun:
Location: Fields Shack
This weapon will be found lying on a shelf inside of Fields Shack which is near Nellis Air Force Base.
Location: Hovering Anomaly
Requirements: You must start the game with the Wild Wastleland Trait, otherwise you will not be able to get the Alien Blaster.
This weapon will be found at Hovering Anomaly as long as you meet the requirements.
YCS/186 Gauss Rifle:
Location: Mercenary Camp
Requirements: You must NOT start the game with the Wild Wasteland Trait.
You will find this weapon at the Mercenary Camp as long as you meet the requirements, not taking the Wild Wasteland Trait, which prevents you from getting the Alien Blaster unless you prefer this weapon more.
Location: Sunset Sarsaparilla Headquarters
This weapon will be on the body of Allen Marks after you have completed the Side Quest titled The Legend of the Star.
Tesla Cannon: Tesla-Beaton Prototype:
Location: Crashed Vertibird
This weapon will be on the ground near the crashed Vertibird. This area will be heavily surrounded by robots protecting the crash site. It is also right near the Nuclear Test Site and the Searchlight Airfield.
Q-35 Matter Modulator:
Location: REPCONN Headquarters
This weapon will be in a pod casement in the locked shipping room inside the REPCONN Headquarters Shipping Room.
Location: Vault 22
You can find the Laser Rifle: AER14 Prototype at Vault 22 on the Fifth Level Pest Control. When you get off the elevator you will then head down the hallway to your right ahead of you.
Then enter the stairway to the Vault 22 Common Areas to find the energy weapon on the ground right before the next set of stairs with rubble blocking the path upstairs. This is why you had to go through the Fifth Level. It is also right next to a skeleton.
Location: Vault 34
This weapon will be in the Armory Cache in Vault 34.
Location: Charleston Cave
You will find the Oh Baby! melee weapon at the very bottom of the Charlestown Cave. While you move through the cave and kill the nightstalkers, take the left path which will lead to a small area filled with water. Just past this up the hill, there will be dead nightkins lying on the ground.
The Oh Baby! melee weapon will be lying to the left of one of the dead nightkins that is carrying a chewed stealth boy which is needed in the Side Quest Guest Who I Saw Today.
Location: Camp Searchlight
This weapon will be inside of the restrooms on the upper floor of the Fire Station inside Camp Searchlight.
Blade of The East:
ocation: Legates Camp
This weapon is carried by Legate Lanius at the Legates Camp. Kill him to get it.
Nephis Golf Driver:
Location: Samson Rock Crushing Plant
This weapon is carried by a Fiend named Driver Nephi in his territory at the Samson Rock Crushing Plant.
The Humble Cudgel:
Location: Sealed Sewers
This weapon will be found near the Prospector corpse inside of the Sealed Sewers.
Location: Chances Grave
This weapon will be inside of Chances Grave which is near the Tribal Village and the Makeshift Great Khan Camp. It is also North of Goodsprings. You will need a shovel in order to dig up the grave, you can buy one from Chet in Goodsprings.
This weapon is carried by Dead Sea in Nelson. Kill him to get it.
Location: Wolfhorn Ranch
This weapon will be found on the stove of the Wolfhorn Ranch.
Location: Kings School of Impersonation
You will need to kill Sergio, whom is a hair dresser, in the last room at the back of the building.
You might hurt your relationship with the Kings by killing Sergio, and possibly Karma. It is your decision if this melee weapon is worth killing Sergio over or not. There is no other way to get it.
Location: Black Mountain
You will need to kill the Nightkin Sniper that is at the very top of Black Mountain. Then head to where his body is and you will find that he is carrying the Annabelle Missle Launcher.
One of the companions, Raul Tejada, will also be found inside of the Prison Building here at the top.
Location: Nellis Array
This weapon will be found lying on the floor near the Ant Mount in Nellis Array.
Holy Frag Grenade:
Location: Camp Searchlight
Requirements: You must start the game with the Wild Wastleland Trait, otherwise you will not be able to get the Holy Frag Grenade.
This grenade will be in the basement of the eastern church in Camp Searchlight as long as you meet the requirements above.
Location: Dead Wind Cavern
This weapon will be on the floor of the cavern near the body of a dead Brotherhood of Steel Paladin in Dead Wind Cavern.
Location: Ruby Hill Mine
This weapon will be on the body of a Jackal Gang member inside of the Ruby Hill Mine.
Location: Black Rock Cave
This weapon will be found near the body of the dead Prospector in Black Rock Cave.
Love and Hate:
Location: Bonnie Springs
This weapon will be on the Viper Gang Leader in Bonnie Springs. Kill him to get it.
Location: Camp McCarran
You will need to kill or pickpocket Little Buster in order to get the Cram Opener.
You can find him majority of the time during the day at the front right side as you enter Camp McCarran. He will be practicing his punches on the dummy in front of a yellow busted up truck.
If you kill him you will gain infamy with the NCR, so decide if this matters or not to you.
Recompense of the Fallen:
Location: Cottonwood Cave
You will find the Recompense of the Fallen inside of Aurelius of Phoenixs desk at his office. His office is on the 2nd floor, with a balcony.
Location: Lucky 38 Casino
You can find the Golden Boxing Gloves on the Casino floor at the Lucky 38 Casino. It will be at the VIP Bar above the Cashier room which is on the left side of the Casino when you enter.
Explore the Mojave Wasteland!! and Thank you Bethedsa.
Can't wait for the New Vegas add-ons.