Hi Juan and welcome. Firearms, depending on manufacturer and model will come in either a Cardboard box, hard plastic carry case, soft carry case in a box. We could give a specific answer if you had a particular firearm in mind. Cheers, stay safe and enjoy!

some do some dont

Hi Juan, some guns come in a cardboard box, others comes in a soft case, others in a hard case. Most, but not all, pistols come in a hard carry case.
Stay safe & have a great day!

It depends in the model firearm, I'm assuming you mean pistols? If so, many come in the manufacturers branded hard plastic case. Some guns like the Springfield Hellcat come in a zipper bag & some just come in a cardboard box.