The Swallowtail 988/127-2 is an early game Field Weapon whose primary purpose is to engage enemy infantry and suppress defensive structures for infantry to destroy them. Due to it being the earliest 12.7mm piece of equipment in the game, it provides a major advantage as it allows the quick destruction of rushing infantry, as well as smaller structures like Tier 1 bunker pieces (although it is ineffective against higher tier structures).
All push guns, by their nature, are one of the most vulnerable vehicles in the game in terms of crew protection. They are exposed to the enemy, making them susceptible to all enemy fire. Due to push guns requiring both crew members to move them, the death of a single crew member could result in the push gun being lost. Due to this, it is recommended to only lock the gun when it looks like enemy infantry are going to overwhelm you and can steal it. This tactic is vital if a push gun is decrewed, as it allows a friendly soldier to quickly man it and drive it back to safety.
Push guns have a visibility mechanic, which allows it to operate differently compared to regular vehicles. Similar to infantry, they are affected by vision, meaning their movements cannot be seen unless it is within your line of sight. Due to this, they can hide behind structures, or even bushes (depends on how big the bush is). It's also affected by the time of day, with nighttime making it possible for push guns to become invisible to the enemy if you're far enough from them. Keep in mind that if the enemy decides to illuminate your position, this will expose it until the flare dies out. The push gun's position will be exposed anyway if the crew decides to fire its main armament.
Prior to Update 0.45, the Swallowtail 988/127-2 used 14.5mm, which was later removed from the game
It was changed to 12.7mm and given a high-velocity modifier to keep its damage output the same as before