Both of these sidearms are relatively similar, but the GSH-18 comes with some extra ammunition at the expense of power. Tachanka is also equipped with the GSH-18 and PMM sidearms. While the SMG can be useful for short-range engagements, the high-powered AK-12 will suit you well in almost any situation. After playing and leveling Tachanka, you will eventually unlock access to the SMG 9x19VSN and AK-12. Your starting weapon with Tachanka is the SASG12 shotgun, which appears to be a little underpowered, but can definitely get you out of a tough spot. The choice of weapon is quite open for Tachanka as her skill is a weapon too. Even if you go down, your team can use your skills.
Although Tachanka was largely considered a 'meme-choice' in Siege, he is actually incredibly useful in Rainbow Six: Extraction with his ability to eliminate large amounts of archeans faster than any other operator in the game. Perhaps Rainbow Six: Siege's most infamous operator, Tachanka is back in the extraction zone to take out some archaics with some classic weapons.
