1. COST ARROW ICON: Nonbolded text before the cost arrow icon must be paid and/or resolved in full before the text after the cost arrow icon can be resolved.
2. INITIATING ABILITIES: Determine the cost (or costs) to play the card or initiate the ability and the player’s ability to pay them, taking modifiers into account.
I would argue that in the 2. Initiating Abilities, the sentence "Determine the cost (or costs) to play the card or initiate the ability and the player’s ability to pay them"
This would take "Gauntlet Gun" (23005) into account that player actually can pay the cost.