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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.


The 10mm SMG is most effective at close-range by unleashing a hail of bullets. However, the SMG is next to useless 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 when enemies start to get too close, particularly given that 10mm ammo is plentiful. The SMG however is very 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.
  • Sim version Gametitle-FO3 OA - 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 contentThe following is based on Fallout 3 cut content and has not been confirmed by canon sources.
  • 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 cut contentEnd of information based on Fallout 3 cut content.


Weapon name (current weapon is highlighted)Icon gunDamage per attack (damage per projectile)Icon damageDamage per secondIcon dpsAttacks per secondIcon attackCritical Chance % multiplierIcon chanceCritical damageIcon critical damageAttacks in V.A.T.S.Icon sequenceAction Point costIcon actionDamage per action pointIcon dapWeapon spreadIcon spreadMagazine capacity (shots per reload)Assault carbine extended magazinesDurability (number of attacks before breaking)Icon repairWeightIcon weightValue in capsIcon merchantValue to weight ratioIcon ratio
10mm submachine gun 7
Sydney's 10mm "Ultra" SMG 9