Basing these stats off of the Sniper's SMG:

-25% ROF no accuracy buff, -33% ROF
+80% Clip Size or +100% Clip Size if 3s reload time
+200% Reload Time or +300% Reload Time if double clip size
+25% Damage Increase
+20% Accuracy?

Loadout slot: Secondary. Perhaps make it available to Snipers, Medics, and Engineers - maybe even Scouts - as alternatives to their own respective weapons: the Engineer's shotgun, the Scout's scattergun, the Sniper's SMG, or even the Medic's syringe gun.

The idea is to offer an alternative through higher alpha damage despite a lower rate of fire. Perhaps a little less total damage per time in exchange for improved accuracy.

Even if they make this gun like the Lugermorph, the Original, and it having the exact same stats as the Sniper's SMG, I'd still appreciate it being added into the game because the model looks simply amazing. Job well done to the maker.