Umarex Umarex Hammer Dead Trigger?

Hello all, I'm pretty new to the world of PCP and especially new to the world of big bore air rifles. So as luck would have it I happened upon a deal while purchasing a compressor off of marketplace where the seller also was willing to let 2 rifles go with the compressor on the cheap has he had no interest in the hobby and had inherited from his father who had recently passed.

One of these rifles being the Umarex Hammer, I took the Hammer out to my property in hopes to test it (Not sure if it's loaded unloaded etc). When I unscrewed the field safety and flipped the manual safety and applied the trigger....nothing... just essentially a dead trigger. It almost feels as the gun isn't cocked, however when trying to cock the bolt it will only come back maybe 1/4" to 1/2" if that. If I hit the magazine release it pops the magazine out maybe 1/16th of an inch but it feels like it doesn't want to come out of the gun Im guessing because the bolt is still technically holding the magazine in place. When I got this rifle from the man it had approximately 3k psi in the tank and the other rifle was empty, before I took it to test I topped it off not thinking that I would run into a problem.

When I try to rack the bolt I would say I've probably applied 15-20lbs of pressure on it and it has not budged past the 1/4 to 1/2" point from fully forward. The rifle holds air and overall seems to have been well taken care of, so this could very well be me missing something vs a rifle malfunction. The best way I would describe the situation is the gun thinks its cocked but the trigger isn't set. If I removed the manual safety there is an obvious difference in the amount of travel with the trigger between safe and when on fire its just its not doing anything once I run out of trigger travel.

So here I am hoping someone with more knowledge than myself might be able to point me in the right direction to investigate, or maybe there is some firing protocol that I haven't seen or maybe overlooked in the manual.

Any help or advice is greatly appreciated, thank you for your time.