12.7mm SMG Stacked Magazine

 is a weapon mod for the GRA 12.7mm submachine gun in the Fallout: New Vegas add-on Gun Runners' Arsenal.

Effects
Increases the magazine capacity of the GRA 12.7mm submachine gun with +6 rounds. This mod causes the magazine of the gun to extend further along the the top of the gun.

Location
Sold by Vendortron at the Gun Runners (Fallout: New Vegas)

Sold by Traveling merchant