Bolt

This article is bad, and you should feel bad about it.

1.Bolter

Bolters are submachine guns, if submachine guns fired 20mm armor-piercing rockets. The bolts (read: rocket propelled explosive bullets) are about as big around as your fist, and detonation upon impact. Imagine getting a grenade fired into a random orifice mach 2, which then detonates. It literally violates everything everything in the immediate vicinity (and not in a good way). But of course, it doesn't just stop there now does it? No, it's a mother fucking assault rifle, so the bitch has seven more like it following it, and they all think your head isn't "mooshy" enough, so they all just kinda blow you up. Does it end there? NO, of course not. Bolter rifles are used by Spess Muhreens, so they're followed up by a nine foot tall giant in a suit of armor that even Oprah Winfrey would have no problem hiding behind, and they proceed to kick your ass with their giant fucking swords and uber fists.

 Now you're fucked.

Bolt Pistol

Bolt Pistols, are like, a Bolter's Daughter, but the really slutty one, so everyone can have go with one. Spess Muhreens use them too. But all Commissars have them, and they'll all be like, "HERESY" while your on the shitter, or, "HERESY!" while your shooting at the range, or doing your girlfriend, or getting your severe head wounds checked out by the medic. What's worse is that Bolt Pistols have NO drop in stopping power from the aforementioned Bolter, so your head just got a new hole. It's kind of a stupid weapon, because a Bolt Pistols range would be the same as a bolter because the range comes from the propellant in the Bolt not the barrel rifling. So why would you carry a Heavy Boltgun when a Pistol is just a good? Because in the 41st Millenium there are more fucktards per 1000 head of population than in, say, Alabama.

Bolt Pistols fire a smaller shell than their heavier cousins, giving them even less recoil as the propellant has less time to fill the short barrel with gasses before exiting. This in turn leads to a lighter payload, and since the potency of bolt weapons comes from their explosive charge, and not the shell's velocity, the amount of propellant was reduced to keep the charge the same size. Similarly, the Bolt Pistol is less accurate than the Bolter is because the Bolter has invuilt targeting devices accessible by Power Armor helmets, and the Bolt Pistol has less rifling to keep the bolt straight. In all the time the Imperium had, hey never developed smaller bolt shells that spin themselves. Go figure. It's not like the Commissar cares, he always fires it point blank anyway.

Heavy Bolter

Heavy Bolters are basically machine guns on PCP. They are a Heavy Weapons choice for Guardsmen, who require a two man team just to operate it. However The Giant space Marines wield them like a fat baby's lollipop and have even attached bayonets to them. If you weren't squishy enough, getting hit by one of these will make you squishy...er...

In Summary

 Be a part of The Imperium of Man, and you get these weapons. 
 Chaos is not your friend. 
 The Emprah is your Savior.
 *BLAM*