Olin-Winchester SALVO Rifle

The Olin-Winchester SALVO Rifle is a prototype battle rifle created for the US Army's SALVO project to improve hit probability. It consists of two T48 FALs grafted together, chambered in a special lengthened .308 case which fires two 5.56mm NATO projectiles, named the 5.56mm T65 Duplex. For every pull of the trigger, this rifle fires four shots with relative accuracy, though its recoil exceeds even World War II era infantry rifles. If that wasn't enough, it is capable of fully automatic fire, perhaps being the only battle rifle able to magdump 80 rounds on target in a single go. The Olin-Winchester SALVO prototype's schematics were sold to an obscure Swiss mercenary group, and the weapon is now produced in said country for operations across the globe.