You can easily pop off its head or take out one of its legs. Use it against a slow enemy such as a Pregnant.Using it at close range isn't a good idea, but if you're good with semi-automatic rifles, it can be a very effective, almost-always one-hit kill against most enemies, even with body shots.
Only use the Seeker Rifle when there's a good distance between the player and any given Necromorph.
Seeker Rifle: Military Engine with Precision Tip.Patrol Seeker Rifle (Firing speed +5%, Reload time -5%).EarthGov Seeker Rifle (damage +5%, firing speed +5%).