Crimson Bolt

Source: npc/quests/gunslinger_quests.txt

1. In Butcher repair branch, talk to F. Harrison (lighthalzen 205,284) at gun_na == 100.
2. During broken-Butcher dialog, he loans you a weapon.
3. You receive:
getitem 13102,1 (Crimson Bolt).
4. Later you must return it when turning in repair materials.

This is a temporary chain item, not a standalone final reward.