Game about a washed-up Space Marine, science babes and slimy aliens...and of course zombies! <...insert mutants if you hate zombies...>
Matter Replicators will let Blake refill on ammo and other staple consumables. Since we are heavily focusing on gunplay a 'plausible' way of refilling on ammo is very important.
We really didn't want players to rush back to town every 3 minutes and making ammo reserves unlimited just seemed wrong. So, this is when we came up with the idea of replicators. By introducing them into the world of DB as devices that are commonplace in everyday life we can get away with making them 'ammo cloners'...hopefully.