Sammy

"This weapon was custom-built using Kalash as a base, its extensive modifications aimed at increasing the weapon's combat efficiency. Featuring a three-round burst-fire mode in its primary configuration, it is also capable of firing incendiary ammunition, which is especially effective against certain kinds of mutants."

- In-game description

The Sammy is an assault rifle created by survivors in Vladivostok. It's one of the new weapons in Sam's Story, a story DLC for Metro Exodus.

Overview
Created after World War III by gunsmiths in Vladivostok, the Sammy is a Kalash rifle modified to use incendiary rounds that were also developed in Vladivostok. To prevent people using these rounds in regular Kalashs, and ruining them trying to fire the hotter ammo load, Sammys were designed to use a different magazine to the standard rifle.

This weapon is first given to Sam by Danila, after meeting Tom on USS Mayflower.

In comparison to the regular Kalash, Sammy has higher base stability, deals the same amount of damage when using regular ammo but has lower accuracy and rate of fire. One area where the two weapons differ dramatically is the upgrade system. Whereas the Kalash always remains a fully automatic assault rifle/light machine gun, the Sammy can be converted to a true marksman rifle or to a short-range weapon with high rate of fire and magazine capacity, similar to a submachine gun.

One should keep in mind that, unlike the Kalash, the Sammy does not have access to a suppressor, thus making it impractical for stealth.

Variants and Customization
The Sammy has five upgrade slots, with three options available for each one of them. One feature unique to the Sammy compared to other assault rifles is that upgrading the barrel also changes the firing mechanism, allowing the user to either fire in full auto, three-round bursts or semi-automatic.

Trivia

 * The rifle is a modified version of the Kalashnikov/Izmash AK-12 rifle prototypes made between 2011 and 2015 (probably one of the earlier ones, considering the timeline), equipped with a custom handguard, magazine well, and stock, with the picatinny rails replaced by the dovetail mount commonly used in post-WW3 Russia, as confirmed by concept artist Ilya Tolmachev's Artstation profile.
 * The Burst Fire upgrade adds the Picatinny rails seen on the AK-12, making it look a bit more recognizable.
 * The heavy stock and drum magazine modifications mimic the real-life magazines and wooden furniture of the 1928 Thompson sub-machine gun, copying its 50/100 round drum magazines as well as its distinctive forward grip and buttstock.
 * Instead of the top mounted charging handle of the 1928 pattern, it has a side mounted charging handle similar to the M1A1 pattern used extensively in World War II.
 * The muzzle brake the weapon uses in its fully automatic configuration is also similar to the one used by the Thompson.
 * The heavy stock also has a detailed carving of a bald eagle on it.
 * The name is likely also a reference to the Thompson, as one nickname for it is the "Tommy Gun".
 * Although the Sammy was ostensibly designed with proprietary magazines to handle incendiary and/or over pressured ammunition that the Kalash could not, there is nothing stopping a shooter from simply loading the more powerful rounds into an AK magazine as usual, since both rifles use the same caliber.
 * Kalashes are capable of firing incendiary ammunition just fine. Starting from Metro: Last Light, military grade rounds were reworked to be incendiary in addition to just being more powerful overall, and they behave the same way when shot at a target as the new ammo type in Sam's Story.
 * Loading and firing the special incendiary ammunition does not make the Sammy overheat faster than it would normally.