I require assistance in trying to ascertain why my Singularity Pistol design seems to have the same recurring issue.

In essence, the pistol sometimes fires as intended (Hitting the target and detonating on target), but in other cases, the projectile (Singularity snow) ends up detonating mid air, close to the barrel / within its safety box and, at one point, it seemed to have detonated within the chamber itself.

Any help trying to figure this out would be greatly appreciated.

EDIT: Initial issue's been mostly fixed now. However, I'd love to hear feedback about it if possible.