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For an overview of submachine gun models in the Fallout series of games, see Submachine gun.

The 10mm submachine gun (SMG) is a small gun in Fallout 3.


10mm SMG blown up

10mm submachine gun expanded

The 10mm SMG is most effective at close-range by unleashing a hail of bullets. However, the SMG is significantly less useful at longer ranges unless assisted by the perk Concentrated Fire. The SMG simply has too much spread to be of much use beyond close-range combat. Another downfall of the SMG is its ammunition consumption; if ammunition is not properly managed, the SMG can eat through 10mm rounds at alarming speeds. With full automatic fire and a 30-round magazine, the SMG is a decent emergency sidearm against most wildlife and unarmored humans, particularly given that 10mm ammo is one of the most plentiful in the game. The SMG is also quite common, making it easy to repair and is recommended to lower level Small Guns users.


The 10mm SMG can fire a total of about 1190 times, the equivalent of 40 reloads, from full condition before breaking.


  • Sydney's 10mm "Ultra" SMG - Relic hunter Sydney's weapon of choice, the Ultra SMG holds an astounding 50 10mm rounds in a single magazine, and deals more damage than the standard SMG.
  • Gametitle-FO3 OA Sim version - A sim-only version of the weapon which differs only in health, with a whopping 999,250 hit points. Essentially preventing the gun from ever degrading, well over 1500 rounds of ammunition can be fired without it degrading 1%. The weapon is not accessible outside of the simulation without the use of the Gary 23 exploit or console commands. It can be obtained in the sim through certain equipment packs on the equipment terminal.
  • Icon cut 10mm Alloy Steel Submachinegun - Another version of the weapon was cut from the Operation: Anchorage add-on. Called the 10mm Alloy Steel Submachinegun, it is otherwise identical to the standard 10mm SMG.


Icon melee- Weapon name (melee or unarmed)Icon sequence- Attacks in V.A.T.S.
Icon gun- Weapon name (gun, energy or explosive)Icon action- Action point cost
Icon damage- Damage per attack (damage per projectile)Icon dap- Damage per action point
Icon dps- Damage per secondIcon spread- Weapon spread
Icon explosion- Area of effect damageAssault carbine extended magazines- Magazine capacity (shots per reload)
Icon effect- Effect damage & durationIcon repair- Durability (number of attacks before breaking)
Icon bonus effect- Bonus effectsIcon weight- Weight
Icon attack- Attacks per secondIcon merchant- Value in caps
Icon chance- Critical chance % multiplierIcon ratio- Value to weight ratio
Icon critical damage- Critical damageIcon ability- Skill required
Icon crit effect- Critical effect damage & durationIcon fist- Strength required
Icon plus- With all mods attached
Icon gunIcon damageIcon dpsIcon attackIcon chanceIcon critical damageIcon sequenceIcon actionIcon dapIcon spreadAssault carbine extended magazinesIcon repairIcon weightIcon merchantIcon ratio
10mm submachine gun 7
Sydney's 10mm "Ultra" SMG 9



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