How do I make guns in TurboFusion's gun kit more accurate?

Basically I'll spend and hour configuring the AimPart to be in the perfect position only for the gun to fire to the far left despite a spread setting of 0. I've also encountered a bug where random guns cause the player to walk in place, further decreasing the accuracy. I'm trying to make a DMR, so accuracy is a key feature. The kit can be found here And the place I'm using the guns on can be found here with guns in the starter pack that showcases the issues. I would prefer to not use the GUI scope if at all possible. I hate how it looks and how little customization I have with it. I'm not including the code because it involves multiple scripts and I think that the walking glitch isn't specific to TurboFusion's script.

I'm sorry that this seems like self-advertising. I hate that sort of thing myself, but I'm trying to give everyone a few examples. of the issues I'm having with actual ingame items.

Set the spray, or accuracy to 0.....