Rules say one point less recoil than default bullet.
And then you have fifteen hundred metres per second muzzle velocity, so would expect a supersonic crack.
which is reasonable, as there is wasted power in all explosive propelled rounds; just how much is a function of barrel length, barrel diameter, round diameter, and powder load. Basically, if you don't have enough powder to put gas expansion past the barrel's end at the speed desired for the bullet.
A Gauss pistol can change the configuration, instead of putting the weight in or before the hand like a traditional pistol you can put most of it aft with an extendable stock, getting an almost carbine length barrel.
Bullpup configurations work fine for explosive-propelled rounds; that's not an advantage unique to gauss weapons.
The main reason we don't see bullpup pistols is regulatory. Many places don't like the idea of carbine length barrels on one-handed weapons. (noting that bullpupped rifles and carbines can usually be fired with 1 hand more accurately than under-action or behind-action grip weapons.(Most battle rifles and assault rifles are pistol-grip behind the action; most pistols are under the action.)
Secondarily, ergonomics. A bullpupped pistol usually doesn't have enough space for a magazine in the standard vertical orientation below the action; horizontal/sideways mounting is an awkward twisting force; vertical above the action is blocking aim; tubular (like many shotguns), underbarrel, or overbarrel (like the HK G11 or FN P90) have significant balance changes through the magazine load in pistols that are largely ignorable in 2-handed firearms.
Does anyone have a good handle on using the Gauss Pistol?
Would someone be able to explain it's use in Combat? Or describe these actions:
All the actions are pretty standard. The mag isn't reduced much, but what's in it differs: it's got a bunch of powerful electrical storage cells (probably superconducting capacitors), and a very thin ammo box. A mechanical mechanism loads the 4×20mm dart just like any normal pistol would load a full cartridge, and the magazine has notably large electrical connections.
Aiming: it's a pistol. Aim like any other.
Drawing: It's a pistol.
Swapping mags: only one minor issue different: making certain the electrical contacts make contact.
Reloading magazines: plug them in to charge after putting the replacement needles in.
Power: Most likely a separate battery in the sides of the grip for powering the basic action, replenished from bleed after firing. Magazines probably have the power for each shot.
multi-mag: it's unlikely to be common, but still doable, to have a two magazines in one magazine body; given the size of the stack, 4×20 is 160 ×4×20 mm, so 6"×5/32"×25/32"... one could have 2 or even 3 side by sides, Separate mags? probably no more than two.
Signature: it's far from silent, given it's putting out a hypersonic round. There is no visual flash, however, unless the weapon is damaged, or the air is creating cavitational glow.