Clearly I took a lot of inspiration from the super shotgun in Doom 2 for the first person view. Other than that I just combined a bunch of my favorite guns and this is what came of it. I actually drew the original of the top image in my biology class, then made that version
Please credit me, @Spartan_the_hawk if you use this in any way. The design and spritework was all done by me (except the flash, I found it on some sheet) The sounds are from Doom 2, which got them from a royalty free sound pack in 1994 or so