No, see, what you need is an open bolt firearm with a diagonal mirror that flips up so the sight looks straight down the bore. That way the shooter can see exactly what the rifle is aimed at. Like a DSLR.
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Meanwhile, in the grim darkness of the far future, they have scopes so advanced they can see right through the enormous front sight that blocks the entire field of view.

Why does it have two barrels?
If I had to make up something, since by canon it shoots high explosive rockets, the exhaust has to go somewhere, and this solution might even reduce recoil.
In reality, I think the designers just saw the picture of an AK with the gas cylinder and didn't know what it was for.
Which makes sense since they are Brits.
Top one is a camera apparently.
"More barrels = more dakka." -Some techpriest, probably
Those are decoys.
Space Marines just know where the gun is pointing, with superhuman accuracy. If they spot someone using the sights they know it's an imposter and kill them.
There are no friendly fire incidents in the Space Marines...
Of course not. Just between Space Marines and Chaos Space Marines. Or Space Marines and the Imperial Guard. Or Space Marines and Sisters of Battle. Or Space Marines and the Inquisition.
Listen, it's very simple.
The Emperor will guide your shots. If one is inaccurate, they must be purged like the Xenos scum they are.
Doesn't matter, cybernetic linkage somehow solves their targeting woes
Up high, down low, too slow?