its just a single sine wave pitched up 3 octaves. That's what the metallic sound is from. Its not one synth. I used layers to get that gun sound (even tho it still sucks ass D: )
Hey, check Bandlab, I just recommended you to a dubstep band with more popular people to try to grow you, man. Your song, The Abyss, is literally Teminite - level. If you're really 14, that's insane dude (if you don't want to join it's aight tho)