12.7mm Submachine Gun

The 12.7mm submachine gun is a weapon in Fallout: New Vegas.

Characteristics
 More common at higher levels, the 12.7mm submachine gun is a heavy-duty large-caliber submachine gun (SMG). It features an unconventional top-mounted magazine, which lies parallel to the weapon's barrel. It boasts a high damage-per-second but suffers from a small magazine capacity and a fairly large spread.  Unlike most other submachine guns, the 12.7mm submachine gun is classified as a two-handed weapon; because of this, traveling with the weapon unholstered will slow the player character's movement speed. This also causes the weapon to be holstered on the back, rather than on the hip as with most SMGs. This also affects it with regard to the Jury Rigging perk, putting it in the same repair class as the service rifle and light machine gun, instead of with one-handed automatics like the 10mm and 9mm SMGs.

Durability
The 12.7mm submachine gun can fire a total of about 2495 standard rounds, the equivalent of 119 reloads, from full condition before breaking.

Modification

 * 12.7mm submachine gun silencer - Silences the weapon.

Variant

 * 12.7mm submachine gun (GRA) - A variant of the 12.7mm SMG capable of more customization than the standard variant.

Locations

 * Bloodborne cave - Behind a Very Hard locked gate near a trunk holding just under 8000 caps. There is a key to the booby-trapped gate lying by the campfire in the back of the cave.
 * Great Khans have been observed having the weapon on them in relatively low condition at higher levels.
 * Gun Runners - The Vendortron sells one.
 * Hidden Valley bunker - It can sometimes be bought from Knight Torres.
 * The Fort - It can be obtained from the veteran decanii. Other high-ranking Legion members may carry one.
 * Commonly found on Legion vexillarius at higher levels.
 * At higher levels, this can be bought from various weapon merchants.
 * In the Honest Hearts add-on, it is used often by the White Legs at higher levels.
 * At higher levels, legionary assassins will carry this weapon.
 * Ulysses carries one in Lonesome Road.
 * Higher level marked men can commonly be found carrying them in Lonesome Road.

Behind the scenes
The 12.7mm SMG is almost entirely fictional, though a couple of elements were loosely inspired by the FN P90 and TDI Vector.

Bugs

 * Although the weapon's value at 100% condition is 5089, it can be repaired up to 5096.
 * Sometimes, when firing in first person view, the bullets won't appear but the ammo, but will be spent as normal.
 * After equipping the silencer, weapon may only do damage when using VATS mode.