I Use a assault type II DS, the base sniper rifle with a damage modifier, shield extenders, a Toxin SMG, nanohives, and a militia armor repair module. all the basic necessities for long range combat and reconnaissance.
My priorities when sniping are (from top priority to least important) enemy snipers/campers, stragglers, cappers, medics, heavies, and grunts.

I engage in Anti Sniping first and foremost checking ridge lines and crevaces before staking out those would be meat bags.
Even more enjoyable to head shot when they are jumping up and down.... nom nom
Tip#1 : whenever you are shooting from your hiding place and you are suddenly compromised?, fend off you attackers as best you can, and if you die or survive the encounter, make no attempt to return to that particular area, always assume that the enemy is the most patient bastard on earth. it will take some effort to find a new hiding place, but mostly its worth it.

I am one of those patient bastards that does wait. Also, i keep checking back if i leave the AO for any reason.

Tip# 1.5: have a secondary weapon equipped in your sniper fitting. always keep it out until you either found a potential sniping position or you are moving in between nests. you will stand a better chance of surviving an encounter with a red dot or two if you are found.

I like scrambler pistols for this vs submachine guns Preference only

Tip #2: If you see a red dot from far away, you have him in your sights but you worry that you might miss? Dont shoot unless you are confident that you will hit. you will save a few extra rounds of ammunition that way. Instead report it to your squad if they are nearby, they will take care of the rest. which lead me to number 3

Red head dead sniper =)

Tip #3: Always maintain constant communication with your squad, if you decide to hang back and watch the world through the scope, by all means go ahead. but at least make an attempt to warn your squad of any future threats they might encounter from your line of sight. The old saying proves true : as a sniper, you are the eyes of your commander. rehearse simple , direct phrases for when spotting a red dot or possible courses of action.

Will post more tips when i have time

-Safe hunting