The Evanix Rex-Ibex is fitted with full length 22mm picatinny/weaver rails and has plenty of room for accessories such as a bipod or optics, especially with the M-LOK slots on the sides the options are endless.
The ergonomically shaped pistol grip and stock with integrated compressed air reservoir (480 cc) ensure comfortable operation of the rifle.  Furthermore, the two-stage trigger can be adjusted to your own liking.
 
Loading the Rex-Ibex is done by pushing the cocking lever under the trigger forward (lever-action), which simultaneously opens the loading gate and engages the safety.
When cocking, moving the bottom lever no more than half way, the rifle is set for a medium power shot, and moving the bottom lever all the way forward sets it for a full power shot.
 
Heavy slugs (180 to 400 grain) are recommended for the power of the Evanix Rex-Ibex.
Note: The Evanix Ibex uses .498 ammunition.  So not the .510 like the Umarex Hammer or the Airforce Texan.