Well...
Maybe that would be too similar, but moving really fast would completely ruin the gun, something that big would slow you down, though, and perhaps the light up would be a good idea, really bright, flashing, with a siren, and a sign in big letters: "HERE I AM, EVERYONE COME AND GET ME"
But that wasn't what you were thinking, was it?
As for the nailing to the floor, I wasn't thinking of placing it down, more like the recoil accidently ramming a large pole through your arm, that would put you off using it slightly, or you could snipe on a wall without platforms, but the large explosions and bright lights and the entire level being reduced to shreds would give your location away.(And probably blow your head away)