M3
The M3 is described as the hardest-hitting shotgun, with firepower and capacity upgrade paths and a tradeoff against other stats.
How it works
The table lists the M3 in Chapter 3-3, with firepower upgrades through level 13 and capacity upgrades through level 5. Its description says it is the hardest-hitting shotgun but sacrifices all other stats, and frames it as a close-range power choice rather than an extended-range option. The supplied passages do not describe a special unlock tied to this weapon.
When it helps
If close-range power is the priority described by the source, this is the relevant shotgun record.
The tradeoff
The source says the M3 sacrifices other stats for its firepower.
Read the supporting references
A source-bounded reference to named main-campaign weapons, described upgrade characteristics, and unlock conditions. It summarizes selected effects and restrictions rather than every weapon, stat, game mode, or downloadable-content item. Guidance explains the referenced mechanics; it is not a tested damage ranking. Check the stated edition and source version before applying a patch-specific detail.