The dude is right now using:
http://en.wikipedia.org/wiki/M47_Dragon
http://en.wikipedia.org/wiki/M134
http://en.wikipedia.org/wiki/Flare_gun#Use_as_weapons
http://en.wikipedia.org/wiki/Claymore_mine
http://en.wikipedia.org/wiki/Stun_grenades#Stun
And two sci-fi things that if they exist? Aren't doing much by plot. That EZ Gun's never saved a person's life in a serious injury in story, and hell, Amanda sits on the bench for ages just because of a broken leg. And the railgun's vastly inferior to the one 30 or so years later in the timeline, it can't even power itself especially well, not to mention the concept of it exists in real life (same for gauss firearms and such).
What you're basically doing is tearing out all of the grounding of it being science fiction and just making it fanfic bull**** about how Big Boss could beat Goku with his M1911A1.
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