Which weapons are these?

https://preview.redd.it/loovoix7cv4h1.jpg?width=640&format=pjpg&auto=webp&s=d507dbfa109a5581a0e4296ef6ca4e8a74c49b45

Can anyone tell me which Gunner weapons these are? I'm guessing #2 is a grenade launcher and #3 is a flamer, but I would like that confirmed and have no idea what weapon #1 is.

Can anyone point me to what the hot-shot volley gun, plasma gun, and meltagun looks like? I want to see if I can Ebay the parts to build those alternate versions of the gunner. (If someone here has the sprues for those alternate builds as well, feel free to DM me).

Thanks in advance for the help.