43

Bring the Tools, not the Weapons The hard part here is getting the precision tooling you will need done right. Rifling a barrel and pressing ammunition is pretty darn hard without the right equipment, but all the tools needed to set up a fire-arms and munitions workshop take up surprisingly little space. Since he has enough wealth in the 21st century to ...


35

With most firearms, the simplest, quickest way to "brick" the piece (without killing or maiming anyone, including the users) is to weld moving parts together so they become non-moving parts. The cylinder in a revolver can't rotate, the firing pin and slide in a semi-auto won't move on their rails or in their passage. The ammunition would be unsafe to ...


33

Unless he's an expert metallurgist the biggest issue you're going to have isn't in terms of producing the parts; anyone with a drill and a hand file (or some rocks that will serve the purpose) and enough patience can make a gun from a solid block of appropriate metal and therein lies the problem. Modern weapons require modern alloys, many of which are ...


26

TL;DR: deflection due to coriolis force depends strongly on the angular velocity of the station. In slow rotating stations (eg. very large ones) coriolis effects on short range engagements will be negligible, but can be significant at longer ranges (eg. 100s of metres). In very fast rotating stations (eg. very small ones) the coriolis effects will be so big ...


25

Solar Charging Electro-magnetic Flechette gun How advanced is the most advanced world you've encountered? A Coil-gun is perhaps the most reliable weapon imaginable. It fires reliably underwater, in space, in mud.. The entire weapon can be sealed in plastic and it has virtually no moving parts whatsoever. It cannot jam, it doesn't misfire and requires ...


23

Best solution is to skip the gunpowder - too difficult to manufacture while traveling or carry vast quantities, and a bit of a pain to deal with anyway. Of course if you are relying upon the giant cloud of smoke to obscure you and the target and loud bang to scare the primitives off, then go with black powder, but honestly I would rather shoot them than ...


19

I'd recommend the Colt Pocket Percussion Revolver, possibly supplemented with a good muzzleloader (they've got easy-to-maintain modern ones now) for ranged shots. Sorry, I'm sticking you with ball and powder. Modern ammunition is pretty great, and not hard to make with modern techniques - but that's the thing. It's best with modern techniques to get the ...


17

Generally speaking I'm not a fan of hybrid weapons like this, since the general result is that you wind up, as @AndreiROM pointed out "Turning two good weapons into one crappy one." There is an exception scenario though, so that's what I'm going to design to. That exception is when you have something big and fast charging you, and you want to be able to ...


15

"Wild Bill" Hickock is recorded as having shot a man (who apparently needed killing) through the heart at 75 yards (about 68 m) with a cap and ball revolver. I can guarantee he didn't shoot from the hip in "fast-draw" fashion for that shot, though he probably didn't spend too long at it either, since the other man apparently wanted him dead. Otherwise, ...


15

As long as they do a job and people like them: The basic job of a gun is to shoot something. A gun needs to be relatively simple and reliable, able to be ignored a lot and ready at a moment's notice. While a lot of fancy guns used exclusively for war will be outmoded as soon as a better gun is made, for self-defense people still use revolvers and automatics ...


13

Firearms require a social and industrial ecosystem to exist. Modern weapons with metal cartridges could not exist before the development of deep draw dies and the skilled workers to use them. Even as late as the 1860's (American Civil War) cartridges were paper cylinders holding the powder and the ball, but now you need a cheap source of paper (and ...


13

Essentially the firearm has a smart sight unit attached. Like modern smart phones, it will need an built in accelerometer and a display (indeed, you could probably write an app for an Android or iPhone today), the accelerometer to determine the spin rate and angular velocity, the app calculating the offset and the display giving you the target information. ...


13

Burning of the gunpowder is no different in high-oxygen atmosphere - first, because it burns on itself, without contact or dependance to the atmospheric oxygen. Same for rockets: they carry their own oxydizer and propelling gases are already burnt. What will be different: Accelerated corrosion. Of everything. Most other materials will degrade faster, too. ...


13

Gun battles of this sort are dramatic. However, it was not the "realistic" thing. The idea of two honorable martial figures facing each other in formal combat would be exceedingly rare. Most people would wind up getting ended by treachery or happenstance. Far more usual would be for one gunslinger to sneak up on another, or to take a chance opportunity for ...


12

While everyone so far had provided very...entertaining...answers, there are already very old service weapons which fit the bill. The first choice would be the classic Lee-Enfeild rifle fitted with a 22" "Sword" bayonet. The rifle is very accurate and powerful, with the round capable of killing man sized targets past 600 yards (older Lee-Enfield's were ...


12

Yes! The Chinese developed something very similar, although it's disputable if they actually were made. Since the Greeks were already ahead of the curve with Greek fire projectors on ships, the basic engineering could have existed. The Chinese designs were a little more technically developed, but there's nothing there that couldn't have been invented by ...


11

Forgotten Weapons, run by Ian McCollum, is both a website and youtube channel. He offers apolitical discussion on a huge variety of firearms, often talking about the history, variations, and mechanics of said guns. He is still active, and has done videos ranging from two-shot muskets to anti-aircraft cannon.


11

Tvtropes has an excellent article in their Useful notes section called "Gun Safety" as well as a write up of every military in the world, usually making an alliterative pun or historical joke in the title, allusion to a trademark weapon, or rhyming (the entry for the U.S. is called "Yanks with Tanks" while the UK's is "Brit's with Battleships"). https://...


10

Schlock Mercenary has something about shooting in rotating frame references more than ten years ago. https://www.schlockmercenary.com/2008-08-17 Schlock and his commanding officer were shot. Schlock then tried to shoot back and failed. Finally he said "I'm gonna have to walk my shots". In other words, he then included tracer rounds and watched where they ...


10

Use Shotguns What exactly does a Gatling Gun do? It spits out a lot of bullets quickly. Why do you want to spit out a lot of bullets quickly? Because hitting a fast moving target is hard and if you fire a lot of bullets the chances of one hitting increase. So your real goal is to crate a hail of projectiles. Why not use a gun which can create such a hail ...


10

All you really need is heat and knowledge. Copper and tin were very common metals in the world you describe, so the brass to manufacture ammunition is no problem. Gunpowder existed - but only in China - so the early Europeans just hadn’t found it yet. It was there. He needs to be really good at making very precise recipes from natural ingredients. We are ...


9

Nothing. No modern firearm or ammunition will pass for an ancient one. Every speck of metal and every chemical trace will make it stand out as not belonging. Worse no one is reproducing modern firearms or ammunition prior to the ~1800's and metal lathes, chemistry, and precision measurement. Basically if they can make a firearm, they are already making ...


9

The simplest and most universal mechanism in firearms is the hammer/firing pin. Even old flintlock rifles had hammers that would ignite the powder. Many modern firearms have internal hammers, but they are still key components. Prevent the hammer from striking the firing pin and you have effectively rendered the firearm useless. This could be done in any ...


9

TL;DR: yes, you can make guns just fine. What will cause you problems are lubricants and seals, and in older gunpowder firearms, things like slow match. The main issue will be that transporting gunpowder now becomes even more unsafe due to the greater chances of little sparks causing big fires. People wielding guns and operating cannon will be dangerous not ...


9

In modern real-life shootouts, combatants frequently miss even at point-blank range. Never underestimate the effect of nerves, anxiety and adrenaline overload on shooting accuracy. In a life-or-death situation, it's an open question how many men would even be able to find their gun, draw it, cock it and fire. It's not Hollywood, I'm afraid...and with only ...


9

"The only winning move is not to play" - WOPR in Wargames Let us examine some of the background and issues with this scenario: If every duel ends in the death of one of the participants then less than 50% of gunslingers will survive their first duel, less than 25% will survive two duels etc. Hence the quote above - any intelligent person with a sense of ...


9

Yes There are ways that fire magic can be used to enhance a rifle. A bullet travels by way of explosion, and increasing the power of the explosion increases the power of the bullet. It's possible to engrave fire magic on the end of the bullet and, instead of using a striker to hit the primer, the black powder is detonated via magic fire circle, and possibly ...


8

i dont know much about gun but there exist axe bayonet. from https://hugelol.com/lol/86852 from https://www.reddit.com/r/mildlyinteresting/comments/6eonme/found_this_combination_axeflintlock_rifle_in_a/ from https://ilovefunnythings.wordpress.com/2016/03/31/the-british-had-the-bayonet-the-germans-had-the-axe-gun/ from http://thegunsman.com/2013/12/axe-...


8

The current state of affairs is driven primarily by two factors: First, ammunition is cheap, so there's no reason not to use as much as a soldier can carry. Second: Modern armed combat is chaotic and hitting an enemy soldier is generally an exercise in statistics rather than skill. Video games provide an astonishingly unrealistic perspective of what ...


8

Get medieval, get a crossbow! A crossbow has simple enough construction and rugged enough parts that it should be able to handle a good deal of travel so that should fit your reliability criteria. The most vulnerable part would be the string but you could easily bring a few extras and as bows were developed by just about every human civilization at some ...


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