The EVA-8 is a pump-action/automatic shotgun designed for extra-vehicular activity and to operate in zero gravity environments. The weapon was developed from the ground up by Wonyeon Interstellar to provide the IMC Orbital Guard Raiding Parties (aka Shipwreckers) with devastating CQB firepower. The EVA-8 has also been widely used by the Frontier Militia and Badlands Pirates, often acquiring the weapons by raiding remote supply convoys to the Outer Colonies. When in need of massive firepower during first contact, Pilots look no further than the EVA-8.
Despite having a restricted fire rate, the EVA-8 is easily capable of obtaining one hit kills on both Grunts and Pilots. Although the EVA-8 has a decent range for a shotgun, its low rate of fire can make follow-up shots slow, meaning it is advised to aim for one-hit kills when possible. It has an average reload speed.
The EVA-8 fires 8 pellets, however the visual effect shows 11 pellets.
The EVA-8, now rebranded the EVA-8 Auto,reappears in Titanfall 2. Unlike it's Titanfall predecessor, it is now fully automatic, and will continuously fire as long as the trigger is held down - similar to the Amped EVA-8. IT is unlocked at Level 8 (or can be bought for 100 Credits). Getting the EVA-8 Auto to Generation 2.9 will unlock the Worse For WearBanner (with 3.9 and 4.9 unlocking the FIRE and GOLD variants, respectively) while getting the weapon to level 20 will unlock the Ask Again LaterPatch.
Despite the fact that it has a drum magazine, it has an oddly small magazine size compared to the size of the drum. This is likely a gameplay concession and not representative of its in-universe usage.
The weapon has a charging handle similar to the G2A4 Rifle, however the Pilot pumps the shotgun after an empty reload. The inclusion of both a pump and charging handle is similar to the real-world Franchi SPAS-15 or SPAS-12, both of which are capable of semiautomatic and pump action fire. As semiautomatic shotguns often have trouble cycling various specialty rounds, it's likely that this function was included on the EVA-8 to allow it to fire a wider array of ammunition.
Like many weapons, the EVA-8 has been nerfed in the fourth update of Titanfall. It does less damage at mid-range distances as it used to be.