New exotic weapons:
Double repeating crossbow: This crossbow is a marvel of engineering and is masterwork by default, no lesser design could possibly fire properly. Two arms of precision forged steel cross each other on it's fore section while the back incorporates two clips of bolts and two triggers, the whole of which is encased in a heavy plate of steel guarding the hands and often bearing stylized artwork or heraldry as best suits the individual wielder. Each double repeater is custom made to fit a specific wielder and other creatures take a -2 penalty to hit with one that is not fitted to them (stacking with the nonproficiency penalty). A skilled crafter might be able to resize a double repeater for a new wielder (DM's discretion)
Base damage: 2d4 (small) or 2d6 (medium)
Benefit:You may make one attack roll as a standard action. If the attack hits, the target takes damage from both bolts. Critical hits, sneak attack damage, and other precision-based damage only apply to the first bolt. Alternatively, you may fire both arms independently as a full round action and make multiple attacks if you normally could. You may choose which case to fire each bolt from as part of a full attack, for example in case you have loaded the bolt cases with different types of ammunition. You can't make full attacks with this weapon that deal damage for 2 bolts as part of a full attack unless you have the manyshot feat, and in that case you can still only fire a single extra bolt as part of a full attack.
Drawback: Due to its size and weight, you take a –8 on attack rolls if you’re not proficient with it.
Load: Each case of bolts holds 10 bolts. Loading one case of bolts is a full round action that provokes attacks of opportunity; the Rapid Reload feat allows you to reload both cases of bolts as a move action. Crossbow Mastery allows you to reload both cases of bolts as a free action.