MK +1 Upgrade 1
MK +1 Upgrade 1 enables upgrading weapons to MK.2 in the gunsmith to refine and customize them.
How it works
The skill-tree guide names this as a weapon skill. It does not state its cost, prerequisite path, or what individual weapon stats change at MK.2. The forum thread separately reports that the skill/class tree contains paths to unlock higher weapon tiers.
When it helps
A progression option if you want to access MK.2 weapon upgrades.
Read the supporting references
Selected base-game classes, class abilities and proficiencies, and skill-tree upgrades for Ghost Recon Breakpoint. The supplied skills guide is a secondary source. The evidence does not document weapon model comparisons, upgrade costs, or edition-specific mechanics. 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.