This page is a speculation
This page contains information about a gun that has not been fully released yet. Although everything stated in this page is backed by logical reasoning, it is mostly speculation.
The Rancor Sadeye is an upcoming weapon in SAS: Zombie Assault 4. The version of it was depicted, along with the CM X1 Furie, on the February 3rd, 2015 update banner of SAS 4. It can also be found in the game's SWF file (pictured to the right) via a flash decompiler. The gun can be identified as a Rancor weapon by the white skull near the back of the gun and the blades, both of which are traits of Rancor weapons. The drum magazine makes the gun look possibly like a grenade launcher or shotgun. Like the CM X1 Furie, RIA Trident, and technically the HIKS M1000, only the version exists.
This weapon does not have some of its weapon data like the ammo used and actual weapon stats in various SWF files used by the game, therefore suggesting it is unobtainable even with hacks. Practically any user made video that has claimed to have gotten or tested out the Sadeye is confirmed to be completely and utterly fake.
It may be offered as a Championships reward in the future, as it was depicted with the HIKS M1000, RIA Trident, and CM X-1 Furie on the Championships announcement banner (see gallery below).
This gun has some similar features to the Russian Vepr-12 Shotgun when it is equipped with a drum magazine.
This gun has a very similar handle compared to the Rancor Hotspot, as well as a similar scheme to the Shredder.
In a forum discussion, although there has been no official comment on the Sadeye, Spool did confirm that the remaining guns that have their art ready will be released (as it is one of their only options), and the last two guns might be championship guns. Thus, there is a great chance that the Rancor Sadeye will be released, just not any time soon.
As of 4/28/2016 the gun has been confirmed by Rohan on YouTube, seen here.
This weapon may have a reference to the CBU-75 Sadeye cluster bomb. This is an aerial bomb drop weighing 1.8 tons, each bomb containing 1800 one pound bomblets, and stuffed with approx. 600 razor sharp steel shards.
The TEMPLATE-DONT-SPAWN gun has been rumored to have its stats changed for the sake of testing out the Sadeye, since it has a similar augmenting cost now and the DPS is a bit similar.
Currently, Rohan has denied any work on the project shown here: http://prntscr.com/b4ngww. This means that any source claiming to have found the Sadeye outside of Ninja Kiwi is false.
The update banner featuring the CM X-1 Furie and the Sadeye
Championships banner featuring the 3 championship weapons along with Sadeye