The Kobracon, listed as the M82, is a sniper rifle that fires only blast rounds. It takes no attachments beyond its scope, and the wiki rates it the weakest sniper in Far Cry 6.
Blast rounds make it a long-range way to damage light vehicles. Against soldiers, especially armored ones, other sniper rifles do better.
With no suppressor and no other mods, it falls behind the SVD, .308 Carbine and MBP .50. Use it only if you like the Blood Dragon nod.
.308 Carbine
The .308 Carbine is a bolt-action hunting rifle that doubles as a sniper. Its unique versions El Depredador and Sobek Special make it a strong early long-range pick, and Sobek Special comes from the Cache Money treasure hunt.
M38
The M38 is a bolt-action sniper rifle new to the series in Far Cry 6. You get its versions from the Motherland Bundle or Lola's Black Market.
Image: UbisoftMBP .50
The MBP .50 is a bolt-action sniper rifle in .50 BMG with no built-in scope. You attach optics yourself, and its unique El Tirano was meant to kill El Presidente.
SA-50
The SA-50 returns as the M6 Lynx, a semi-automatic .50-class sniper rifle you only get as a named variant. Its stopping power is close to the MBP .50, with faster follow-up shots.