“We need better weapons. The Gun Runners, a little ways from here, have weapons, but we can't get to them.”— Razor
Get weapons for the Blades is an unmarked quest in Fallout.
The Blades need more guns to fight the Regulators. To acquire them, the Vault Dweller needs to exterminate the deathclaws for the Gun Runners.
Upon completion of the quest, the Vault Dweller should ask Gabriel to give the Blades (called "friends") weapons and ammunition as a reward.