+2274
AK-117 RANGE
TOP RANGE ATTACHMENTS
Barrel
+11
OWC Marksman
Muzzle
+8
Monolithic Suppressor
Perk
+3
Long Shot
HOW THEY GET PICKED
For this list I basically went through each weapon's attachments and gather the ones that have positive Damage Range, and positive Range stat change.
I then sort the attachments from highest to lowest, then collect the highest Range change for each attachment type.