So, with the return of weapon mods, I'm able to buy scopes to improve the long range performance of my small arms like Pistols and SMGs.
Better yet, there are some awfully cool unique Pistols out there, like the Scorpion which offers some unique utility if you don't need a Pistol as a primary weapon. Aiming the Scorpion with a Scope is devastating against, for instance, Harvesters, or clumped groups of Cerberus troopers as they're preparing to leave a dropship.
But I'm curious, as I've only had the chance to use this on a Vanguard: Infiltrators gain a time dilation bonus while looking down the scope of an SMG or Pistol? Or is it restricted to Sniper Rifles?