Ok......just for people who haven't figured out how to do this, Sniper Support is used just like a grenade.....to select it, hold
, then press
till you get to the cross-hairs.......
To use it, hold
and aim until you see a green circle, then release
You can only carry 3 at a time, but luckily, if you call the Arms Dealer, you can restock, its in the Explosive category all the way to the right for $3500 a piece
Hope this helps!!! Happy Hunting!!
This was Posted by ME3TSPINNER in another solution: If you go back to Marshall's place, just inside the garage where you turn in your captured bounties on the right is a token for calling snipers.....When you move away from Marshall's place and come back (you don't even have to go that far away), they will reset and you can pick them up/use them again.
Full credit goes to Me3tspinner of course.......
Another tip posted by Allgorhythm: I can confirm that Marshall will snipe all enemies within the circle. Sometimes he will miss or need more than one shot for the kill. However, as long as you've got the green indicator when you call the sniper, you will get all kills within the radius and it will count as just a single use of the sniper.
Full credit to Allgorhythm for his awesome tip!!
Meaning you can get multiple kills as long as there are multiple enemies in the "green circle" when you "throw the grenade"
From my experience I wanted to test out Allgorhythm's idea, I was playing just for fun after I got all cheevos....I "marked" 5 enemies with the "Spotter Grenade", even AFTER they left the radius of the "green circle" after I tossed it, Marshall still got all 5!!! Plus Meetspinners's idea about throwing a Zemi Grenade works to get them even more bunched up!!!