this is Voidbreaker as done by my buddy  trezhurisland

a huge .75 calibre clockwork powered revolver-sword with a gold and silver gilt motif in the burnished steel of the blade and barrel, the revolving chamber held 6 rounds and was loaded with steel-capped gyro-jet rounds the would shatter on impact, sending a highly reactive needle of metal into the target, the heavy gauge, square cased barrel was on the back of the blade and integrated into the first ten inches of the blade at the rear, the drop-point style blade itself was two feet long, single edged and was hollow to boot, half-filled with quicksilver to give supreme control of the blade