IRNV scope

IAn IRNV scope, or infrared/night vision scope, is a scope with night vision, that highlights heat signatures as orange. This is useful for finding enemies at night, through foliage, or other possible cover.

Battlefield 3
The IRNV scope appears throughout the Campaign and Co-Op modes, and may be unlocked in Multiplayer for weapons accepting optical attachments, excluding the .44 Magnum, alongside the first Service Star awarded at 100 kills, the only exceptions being the AS Val, which unlocks the attachment after 60 kills, along with the A-91 and the AKS-74U, which unlock it at 125 kills. All weapons receive a 1× scope with a dot reticle in Multiplayer, while battle and sniper rifles receive a mil-dot reticle and a 4× scope in Single Player and Co-op.

Unlike other unzoomed sights, the IRNV scope sways when in use and, like sniper scopes, can be stabilized by holding the sprint button ( (PC), (PS3, XBOX360)) or using a bipod. The IRNV scope can be partially countered by the Spec Ops camouflage, causing only the player's vest to glow and not the rest of his clothes. Deceased players and destroyed ground vehicles quickly lose heat recognition on the sight and so targets appear fairly prominent, as little else shares the same color.

The scope was first seen in the Battlefield 3 Co-Op Trailer at Gamescom 2011, in which they were attached on the SVD, the M249 and the G3 during the co-op mission "Exfiltration".

Over the course of the game's evolution since release, the IRNV has undergone reductions in effectiveness, reducing the sharpness of heat signatures over range as well as a blinding effect as you zoom in. Essentially it's a useless attachment.