Need a good gel blaster for senior assassin.

Context: My high school in the USA, GA, is doing a senior assassin, and I want to have the best gel blaster with the most accurate aim, fast fire rate, and being able to get people while being safe. I want a strong weapon. I was thinking about getting the SplatRBall SRB400SUB and finding out how to put in metal parts or whatever to make it stronger, but I’m not sure. Any help is appreciated.