as an action, you summon tier one turret

Deployable Turret (Level 1)

Small construct, Unaligned

Armor Class 12
Hit Points 15 (3d6 + 3)
Speed 20 ft.

Saving Throws Dex +4
Damage Immunities Poison, Psychic
Condition Immunities Charmed, Exhaustion, Frightened, Paralyzed, Poisoned
Senses Darkvision 60 ft., passive Perception 10
Languages —
Challenge 1 (200 XP)
Proficiency Bonus +2

Actions
Gunfire. Ranged Weapon Attack: +4 to hit, range 60/120 ft., one target. Hit: 6 (1d8 + 2) piercing damage.

give it a name, I'm sure it'll live long ;)