Tom Clancy's Ghost Recon Breakpoint · Weapon upgrade
MK +1 Upgrade 2
MK +1 Upgrade 2 enables upgrading weapons to MK.3 in the gunsmith to refine and customize them.
How it works
The guide identifies this as a skill-tree weapon upgrade, while the forum response says Tier 3 requires a specific path. The evidence does not establish the exact prerequisite sequence, costs, or stat changes from MK.3.
When it helps
Consider it after you have a specific reason to pursue MK.3 weapon refinement.
Read the supporting references
Ghost Recon Breakpoint skills - best perks, how to complete class level challenges | Rock Paper Shotgun question about upgrade of weapons and use of skill points :: Ghost Recon Breakpoint Discussões gerais
Check the edition and source version for patch-specific details. Guide methodology.