Additional Holster
Additional Holster costs 8 skill points and adds a third weapon slot to the weapon wheel. This allows three weapons of any type to be carried at once, according to the guide.
How it works
The guide suggests using the added flexibility for long-range, short-range, and silenced weapons. It also notes that a fourth slot becomes available after finishing one of the three regions, but that fourth slot is a separate unlock.
When it helps
Useful if you want three weapon roles available without swapping your loadout.
Read the supporting references
Perk choices affecting traversal, stealth, combat handling, carrying capacity, and squad support. Include skill-point costs and effects only where the supplied guide states them. The evidence does not detail weapon customization or named weapon upgrades. 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.