This is a game about Carl the NPC. He can't pick up the gun just like in the Roblox game (roblox game mentioned notes and credits). Anyways, he'll want you to pick up the gun for him and give it to him; however, you can choose to keep the gun and leave or.... just give it to him.
The creator of Carl the NPC and the game on Roblox, NPCs are becoming smart, is Groovydominoes52. Check out his game on the Roblox app. (incase you didn't know click space to pick up the gun).