Energy Weapon in Dream

Recently, I had a dream I was infiltrating a compound, which I believe now to have been a hotel turned military base, and realized I was dreaming. Instead of doing whatever I want though, I went along with the dream, and that's where it gets interesting.

I have never even thought of a design or even concept remotely similar to this: a weapon which fires electrically charged flechettes out of a sub machine railgun (Railguns use magnets, so the lack of all felt recoil is justified.) And apparently, it was effective. The ammo went straight through whatever I pointed the weapon at, and sent all DCs into convulsions on the ground. Unfortunately, the dream ended before I found out what me and my team were searching for.

Anybody else ever thought of something similar, or generated some crazy idea on the fly?