Grenade Launcher
The grenade launcher is another missable weapon in Resident Evil 7, as it’s located behind a locked door in an area that you really have no reason to revisit unless you were just really curious about what lay beyond that locked door. There is a door with a Scorpion lock in the southeast corner of the Baker house, right off of the Drawing Room (which you reach by solving the first light puzzle in the game). If you return once you get the Crow Key, you can access this room (which is marked Supplies) to get some ammo, healing items, and a Grenade launcher. Ammunition for this weapon is scarce (even on Easy), so save it for bosses, or tough groups of enemies. Takes up two item slots.
Burner (Flamethrower)
The Burner is Resident Evil 7’s flamethrower. It’s good for dealing damage overtime, and can stun certain enemies after sustained fire. It’s most useful for the Old House section of the game, as it’s full of insects and the boss is especially weak to flames. It’s found in two parts within the Old House area. When you first get to the house, search the porch to the side (that leads to the water house) for the first part. Then continue on to where you solve the light puzzle. Right outside the door near that puzzle is the other half. Takes up two item slots.