From publisher blurb:
The StarCluster 2 Weapons Design Guide gives you a system to modify weapons to give different ranges, damage, ammo, and other parameters, while still retaining a balanced weapon. With the Weapon Design Guide, you can make an assault rifle tailored for the DC Marines, or perhaps a long-rage, highly accurate assassin's tool. You decide what specific parameters are important to you, and compromise on the others.
In the Weapons Design Guide, the GM can tailor specific weapons for the culture and environment the PCs will be in. No more going to the gun store to get an automatic pistol. Now your PCs can go to Huang Fortunate Star Outfitters on Warren and buy a Seven Sons Model 22-8 Revolver, AKA "The Reaper."