Like the single player game, there are three targeting modes available to choose from: Casual, Normal and Expert. Casual is full lock, Normal snaps-to-target but does not lock on, and Expert has no assist. You can configure your own personal targeting to suit your preferences in any game by using the multiplayer playlists in the menu.
For Competitive games, there are Casual playlists for all game types that are exclusively Casual targeting mode, or that allow players to mix it up and play against each other across a variety of the three targeting types.
There are also playlists for Gang Matches and Free For All games which allow players to use Normal or Expert targeting together (but not Casual).
For advanced players that prefer to strictly play against other free-aimers, Hardcore and Veteran playlists that exclusively support Expert targeting can be used for all Gang Matches and Free For All Games.
Its also worth noting that honing your multiplayer skills with the more advanced Normal and Expert targeting styles will reward you with bonus XP to level up faster than those using Casual.