H&K MP5
The MP5 has piercing upgrades alongside firepower, reload, and capacity tracks; the supplied guide describes it as suited to crowd control.
How it works
The item reference lists the MP5 in Chapter 2-1 and its table shows piercing upgrades alongside firepower, reload speed, and capacity. The Steam guide says its upgradeable penetration makes it a crowd-control choice and lists a maximum capacity of 150 rounds. That guide also says machine-gun ammunition is not sold in the store and that machine guns are the only class with truly automatic fire, barring turrets.
When it helps
If comparing machine guns for the supplied guide’s crowd-control role, this is the one described with upgradeable piercing.
The tradeoff
The source describes machine guns generally as low in per-shot damage and quick to consume ammunition.
Read the supporting references
Check the edition and source version for patch-specific details. Guide methodology.