Let me answer this for you... He thinks it is too simple probably because you took T+T sounds, the hangun model, and made it too gmodish, so he thinks it is not original, but let me say this can you sir make anything better? Something that has never been posted on the forums EVER!!?
PM me with suggestions.
Back in Vanilla Blockland I did work on a mod called StuntBL. Was a mixture of stunt vehicles, and other crazy things like a soundwave gun(would knock the vehicle and players around); which at the time, was extremely original, but now it wouldn't be that impressive due to the physics of the game.
With that said, I'm sure I could make other things, just gotta get back in the groove of working on them. I mean.. its been close to 4 years since I've really worked on Blockland.