A tiny Grineer emblem is visible on both sides of the weapon's receiver.
As of a recent update, the Acrid is no longer silent. It appears to be actually quite loud in game terms. This can still be countered by using the Suppress mod.
The Acrid leaves a stackable damage-over-time (DoT) effect due to its Toxin proc, which ticks 9 times over 9 seconds. Each tick deals Toxin damage.
Enemies disintegrate when killed, similar to Saryn's Miasma. This effect is unique to the Acrid and is not shared with other Toxin weapons like the Torid or the Embolist.
As of Update 10.3, the toxin mixture in the barrel is affected by the Acrid's energy color, and the tiny explosion effect on needle impact. Note that the explosion effect is purely cosmetic.
As of Update 11.3, the Toxin effect's DoT scales with Acrid's base damage, not including elemental mods. To clarify further, onlyHornet Strike and Magnum Force directly affect the DoT. Damage per tick is 50% of this base damage (a rank 10 Hornet Strike will yield a base damage of 112, with the DoT dealing 56 Toxin damage per tick).
Despite its incredibly high base accuracy the Acrid's accuracy value is heavily degraded by Magnum Force well beyond what the mod's penalty would suggest, making the weapon highly inaccurate as a result.
To clarify on how the weapon proc works: the weapon will proc toxin on every single shot, unless another elemental status procs. So if you mod the weapon to deal only corrosive damage using an electricity mod, the weapon will proc toxin on every shot unless the corrosive procs. The proc chance listed on the weapon is actually for any other elemental damage that is created by the weapon.
Semi-automatic firing can be countered by simply adding an alternative way of firing on 'scroll up' or 'scroll down' through the key binding customization.
Getting headshots will not only double the damage of the weapon, but double the resulting damage ticks as well.
Toxic Sequence can cause proc length to double; stacking shots quickly on enemies will cause their health to quickly succumb to thousands of damage a second, with players able to stack many shots at once before the first damage tick expires.