Durability (number of attacks before breaking) Damage per attack (damage per projectile) It also comes with a darker finish and a larger magazine. It has a suppressor/compensator along with internal modifications that boost the damage and slightly elevate the rate of fire. Sleepytyme - added in the add-on Gun Runners' Arsenal.10mm submachine gun recoil compensator - reduces spread by 1.10mm submachine gun extended magazines - +10 rounds per magazine.The 10mm submachine gun can fire a total of about 2495 standard rounds, the equivalent of 84 reloads, or 63 reloads when modified with extended magazines, from full condition before breaking. With full automatic fire and a 30-round magazine, the SMG performs well in close quarters combat. The SMG also has a high ammunition consumption rate, which will empty the 10mm rounds in its magazine in 3 1/3 seconds. In addition to losing much of its damage, the high spread of this weapon requires the wielder to be at close ranges for all of the rounds fired to impact on the target. Although the in-game description for the 10mm SMG lists a high damage-per-second (DPS), its low damage threshold negates most of its power. The 10mm submachine gun is a one-handed automatic weapon.