Basically, it's a big gun. – Increased damage, +40% critical hit damage. Very low fire rate for a Jakobs pistol.
Usage & Description
Due to its low rate of fire, the Rex is best used for medium to long ranged combat. This weapon is effectively similar to a bolt-action sniper rifle. The abundance of ammunition makes it beneficial for long range sniping for much longer than using a sniper rifle alone, however the Rex does not have the high velocity or natural critical damage increase of a standard sniper rifle. The Rex is also not guaranteed to spawn with a scope, so not all variants are appropriate for hitting critical areas at a distance.
The standard Jakobs text on the item card, "Fires as fast as you can pull the trigger", is misleading. Like all Jakobs weapons, the fire rate is capped at the listed value. On the Rex, the fire rate cap is considerably lower than other Jakobs pistols.