At the moment, it takes ages to acquire new weapons or weapon mods. For reference, I have 35 hours in this game since it released - to some this may not sound like much but it definitely is to a gamer like me. (An adult with plenty of other hobbies and limited time.)
The game would feel fresher to me and I would enjoy it more if I was able to try out more of the other weapons and modifications. As it is at the moment, the game feels stale because I'm unable to acquire more tools. Seeing other players with their shiny kit makes things even worse.