This mod is a mod to add a merchant in the country.Weapon it'll add some.

Add location
Primm→Fallout3 Weapons And Medical and DLC4 Equipment And Pre-war Food
Novac→energy weapon
South of Jean sky diving→Melee weapon
Nelson→Legion of Arms and Armor
North Vegas Square→BoS Arms and Armor
Mohave outpost→ NCR Arms and Armor
Beijing Creek building north→Weapons
West Side south of the apartment group→illegal drugs
BoS bunker north→DLC1 equipment
Nipton south→ DLC3 equipment
Sloan southwest→ explosives, industrial goods
Herios One→energy weapon
camp golf→Ranger Weapons
South of Eastern pump→junk shop
NCR share Cropper farm
Mohave northwest tumbleweed farm near→ enclave Equipment
Free side Silver Rush south→handgun only of gun dealer

They are in possession of many of the cap and ammunition.
In addition, it offers a weapon to use it with 20mm bullet.
You can buy a 20mm bullet weapons smugglers. There is also a pulse bullets and grenades.