The Marelok is essentially a cut-down Grinlok, trading out accuracy for increased firepower and rate of fire. Like the Grinlok, its base stats are well-suited for builds that maximize the chance and damage of critical hits, and those that cause many status effects.
The Marelok is a great sidearm for dealing with enemies at short to mid range for players who have a sniper or bow for their primary weapon. The Marelok's firepower is strong enough to be considered a sub-primary weapon.
The Marelok is likely named after the Mare's Leg, which refers to a lever-action rifle cut down to the size of a large pistol.
Closer inspection reveals that the Marelok is indeed a Grinlok with its barrel and stock cut down to size and its magazine moved to the bottom of the gun.
The Marelok's description initially misspelled it as Marelock. This was fixed shortly afterward.
The Marelok is spun around the finger lever after every shot, which was mentioned in Devstream 22 to be a reference to a lever-action shotgun used in the movie Terminator 2.
The Marelok was first showcased in Devstream 22 along with the Grinlok. It was supposed to be released alongside the Grinlok and come as a dual/akimbo weapon, but its release was delayed due to the additional coding required to handle the animations involved.
The color scheme of the Marelok is darker compared to the Grinlok.
Currently the only Grineer unit to use the Marelok is Shik Tal, which has been modified to fire small rockets instead of bullets.