- Buying this box is buying 5.56mm surplus bullets in bulk. Once finished with the transaction, the box will be disposed of and 250 rounds are received in return.
- Surplus ammunition is poor grade ammunition made in large quantities by using corrosive materials in their construction. The resulting product is a slightly more damaging round (+15%) at the cost of more regular maintenance on a firearm (25% faster degradation) due to the damaging corrosive materials used in the round's construction. This ammunition is usually much cheaper than regular ammunition, and comes in bulk packaging.
- If following the trench system when first entering The Fort, all the way to the right of the map, the Courier will find two boxes of surplus ammunition.
- They are sometimes sold by Chet in the Goodsprings General Store.
- They are sold by Blake at Crimson Caravan Company.
- They are sold by Quartermaster Bardon at Hoover Dam in large quantities.
- They are sometimes also sold by Johnson Nash in Primm.
- They are sold by Cliff Briscoe at Novac.
Surplus ammo is useful as companion ammo since a companion's weapon will never degrade.