i keep encountering a bug with the tech sniper rifle in that if you have two different qualities on you some times one will not charge and fire. i found myself completely unable to use my rifle at one point because of this bug but found out eventually that if you drop the bugged weapon and then pick it up again it sorts the bug out and it can fire again. i have not been able to recreate this issue but i thought i'd best tell you how i found to fix the issue in case it affects anyone else.