Sounds like content from a mix of mods. My guess is either OreSpawn or a mix of mods that add animal armour, flan's or some other gun/military mods and shield mods I assume Mine and Battlegear or Spartan Shields.
By the sounds of it you either came across a mod, multiple or a modpack, is what it seems like.
Been a while since I've used any of them so I'm just guessing based on what I remember.
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