Your point isn't quite valid. There are fantasy things with no real world counterparts like space magic, but we have guns irl. We don't fire Star Trek guns most of the time. Stuff like the Vex Mythoclast were left out by the OP as they are fantasy. The guns he's mentioned are modelled on real world guns, and have geometric impossibilities built into them that [i]break[/i] the fantasy, rather than adding to it.

You are saying that star trek is the definition of scifi which it isn't.

No I'm not. You can go into the Terry Prattchett Discworld universe if you want. They have towers there that defy the laws of physics, and are thus aptly described as being held up by dark magics, or simply that gravity it too scared of the wizards and has thusly decided it best to ignore the whole situation. Here we just have lazy impossible things that don't generate any new fantasy, they just look weird. Particularly the scout rifle thing.

So does every scifi gun ever