Rifle.

"When a man with a pistol, meets a man with a rifle, the man with the pistol dies."

This thought raced unbidden thru Lisa's mind, and so she directed her first shots at rifle guy. The first round hit him in the upper chest and the second hit him in the face. He fell from the saddle but his right foot got in his stirrup causing him to hang from his steed. As he fell Lisa thought "I'm no man!"

Lisa then switched targets to revolver guy. Having been caught off guard by Lisa's decision to fight revolver guy now acted. He drew his revolver and fired at Lisa. Both fired at each other at the same time.

Lisa's shot missed its mark. But revolver guy's return shot passed thru Lisa's throat. Lisa tumbled from her horse. As she lay on the ground looking up unable to breath, Lisa saw her two remaining adversaries approach.

"She almost had us, boss!" shotgun guy stated.

"You maybe," revolver guy growled back. "Not me!"

With that revolver guy emptied his revolver into Lisa's prone form, ending her life.