Since in the ongoing series about the Legions I’m obviously going to be talking about their guns, seems to me that I ought to maybe describe the terminology used for those just a bit so that you know what I’m talking about.
That is, inasmuch as terminology has changed from what could reasonably be translated into our firearms terminology, inasmuch in turn as these guns technically aren’t firearms – they’re powered by mass drivers rather than chemical explosions – so while some of the words are familiar, the definitions have changed.
Let me sum up:
There are four basic classes of guns (in the slugthrower sense, that is, and ignoring needlers which no-one counts as slugthrowers even though they technically are) used in the Empire. These are referred to as pistols, carbines, snipers, and slugguns.
The first three of these all work by firing tiny flechettes at HOLY CRAP speed.
A pistol is, basically, any flechette-firing mass-driver handgun.
A carbine is the common flechette-firing mass-driver long gun. The original definition as “shorter-barrelled than a rifle” has more or less gone away, since there are no more rifles – the mass drivers spin their projectiles purely through EM fields – but it translates to the vast number of general-use longarms intended for use in pretty much all combat situations from close-up defense to long-range suppressive, essentially filling both the PDW and assault rifle role.
A modal example has a bullpup configuration and probably has a form factor not dissimilar to the FN P90, the weapon I would expect to play them on television if any of this were ever to be made into television. The barrels, in general, are not significantly longer than the main body.
A sniper is the only really long longarm, long-barreled and equipped with specialist software and sensors for even more accuracy than you’ll get out of an already accurate carbine. They’re the descendants of sniper rifles, only shortened in name because, well, they’re not rifles.
The sluggun isn’t a flechette weapon; it fires macroscopic metal slugs in an anti-material role, or canisters which you can put just about anything in, up to and including using it as a launcher for bore-compatible grenades and gyroc micromissiles.
A battle carbine isn’t a special class of its own; it’s what you get when you mount a regular carbine and an underslung sluggun in the same case for maximal versatility, usually sharing their redundant components.
Of our other common firearm types, this can be said:
There aren’t shotguns, because a simple software change to a carbine can emulate them by firing a burst and oscillating the final stage of the mass driver to produce a spreading cone of flechettes, with all the stopping power and spread of the real thing. You can do the same thing with a pistol to emulate a sawed-off shotgun. Alternatively, you can fire canister shot out of a sluggun to much the same effect.
There aren’t submachine guns, because you just configure your carbine to fully automatic rapid fire, and you have exactly the same effect. Likewise, the machine pistol and the pistol.