This mod is based off of the flash version of the game. Right now it is in early stages. Currently it only adds one armor set, one weapon, ores, and items. In the future, it will have every gun and armor in every tier. It will also have every zombie level. It might also add turrets and grenades. As far as mod development goes, every gun and armor will be added before their other tiers. This goes for zombies too. Prem and Faction warfare guns and armor will also be included. Building blocks will also be added as the mod progresses. Currently it is for 1.12.2 but will be ported to 1.16 after the 1.12.2 version if fully complete. For the people that don't know the game click Here. Note that this will entirely done in Mcreator and Blockbench.
Important note: There is a new version of the mod ready for release but has many bugs. Comment if you want it to release. If not then the next patch will be a bugfix. Anyone can use this in a modpack if you like but some items might be removed, which could cause problems in worlds.

-Important Note- The game Sas 4 is being shut down. Here is ninja kiwi's announcment:

SAS 4 Mod