You can use your action to create a pact weapon in your empty hand. You can choose the form that this melee weapon takes each time you create it. You are proficient with it while you wield it. This weapon counts as magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage.
Your pact weapon disappears if it is more than 5 feet away from you for 1 minute or more. It also disappears if you use this feature again, if you dismiss the weapon (no action required), or if you die.
You can transform one magic weapon into your pact weapon by performing a special ritual while you hold the weapon. You perform the ritual over the course of 1 hour, which can be done during a short rest.
You can then dismiss the weapon, shunting it into an extradimensional space, and it appears whenever you create your pact weapon thereafter. You can't affect an artifact or a sentient weapon in this way. The weapon ceases being your pact weapon if you die, if you perform the 1-hour ritual on a different weapon, or if you use a 1-hour ritual to break your bond to it. The weapon appears at your feet if it is in the extradimensional space when the bond breaks.
in the red color, if your firearm is infuse by artificer and become magic weapon. can it become pact weapon?
The pact of the blade has to be a melee weapon, even if it is magical. there is a separate eldritch invocation that upgrades it to a ranged weapon, and even with that, firearms are not an option. however, a good dm may let you use a gun anyway, because it is cool.
The pact of the blade has to be a melee weapon, even if it is magical. there is a separate eldritch invocation that upgrades it to a ranged weapon, and even with that, firearms are not an option. however, a good dm may let you use a gun anyway, because it is cool.
This is not correct. A pact weapon you conjure out of nothing using the first part of that feature does have to be a melee weapon, unless you have that other invocation you mentioned. However, the version where you bond with an existing magic weapon can use any magic weapon at all.
This was clarified in Sage Advice here and if you read further, they explain why they did it that way.
So, yes, you can use an existing firearm if it's magical, and Artificer-infused items are magical. The utility of this is pretty limited, though. The 2014 version of Pact of the Blade (which is the one OP quoted) provides limited benefits, since in this example the weapon is already magical and you're already proficient with it. All you're really gaining (without adding a bunch more Warlock levels to get more invocations) is the ability to hide it in an interdimensional space, where it takes a whole hour to get it back; stuffing it in a bag of holding would be a lot easier.
Can it?
in the red color, if your firearm is infuse by artificer and become magic weapon. can it become pact weapon?
or this will work only melee weapon?
The pact of the blade has to be a melee weapon, even if it is magical. there is a separate eldritch invocation that upgrades it to a ranged weapon, and even with that, firearms are not an option. however, a good dm may let you use a gun anyway, because it is cool.
This is not correct. A pact weapon you conjure out of nothing using the first part of that feature does have to be a melee weapon, unless you have that other invocation you mentioned. However, the version where you bond with an existing magic weapon can use any magic weapon at all.
This was clarified in Sage Advice here and if you read further, they explain why they did it that way.
So, yes, you can use an existing firearm if it's magical, and Artificer-infused items are magical. The utility of this is pretty limited, though. The 2014 version of Pact of the Blade (which is the one OP quoted) provides limited benefits, since in this example the weapon is already magical and you're already proficient with it. All you're really gaining (without adding a bunch more Warlock levels to get more invocations) is the ability to hide it in an interdimensional space, where it takes a whole hour to get it back; stuffing it in a bag of holding would be a lot easier.