I have a king arms fn fal, I like my gun in general except,... the hop-up doesn't realy work. When I shoot the gun full hop or the least possible hop the bb just goes straight up, so the enemy player or target doesn't get hit. Is the king arms hop-up just bad or is it broken? And can I replace the hop up with a better hop-up? What do you guys think I should do? I love my gun but, I want to use it to and not collecting dust.