I had interpreted the Harquebus to basically be a Spear (ahem, pointy stick) with a gun that just happened to be attached to it similar to the 17th century fad of attaching flintlocks to gauntlets, daggers, swords, canes, or anything else pretty much. Which suits the Ninja well enough. The actual arquebus was a very primitive weapon firing .90 caliber balls, barely able to function, good for maybe one shot per minute (risk of bursting otherwise, and even then, still risk). Basically a tiny cannon with a stock on it, and it hit roughly like a .45acp but was so big it could only dent a breastplate not shoot through it.
The standard musket in Piratez would be superior and the way I interpret it the musket balls probably have a pre-caked wad of propellant like modern muzzleloaders, likely with a peizo sparker so a cap isnt even required, just drop the thing down the barrel, or they could even be breech-loaded and itd be as fast as a single barrel shotgun. With a well developed infrastructure for these primitive weapons over the course of hundreds of years, to the point that the caliber is standardized across the board, the poorer folks of the world would have finely tuned this weapon system to work as basic yet effective as possible without the need for controlled substances like primers or metallic casings.
anyway - have a sprite
it has a shortened stick-y part so that it has a stabby-er pig sticker
somehow this Harquebus feels more sophisticated, like it has more going on with it.
The LR300 is an AR-15 derivative, the ramsh rifle looks too thin to be one and the stock looks like a thinner version of a MG34 stock. Overall I actually like the idea of the ramshackle rifle as a real life weapon. But with the suggested fire rate that means its likely either a bolt action or a pump action model. Y'know actually what it reminds me of is like a really used up Keltec Sub-2000 but with the magazine in front rather than in the grip (since AK bullets are too big)... Its like the kinda thing you'd see in Star Trek being used by people who dont have phasers yet. Also reminds me of those .223 uppers being made for MAC-10 pistols.
One of my fav post apoc weapons of all time was the Hunting Rifle from the original fallout 1 and 2 which is sorta what it represents. Just that it has 30 rounds instead of 10. The raider with the hunting rifle was the one you really needed to take down while everyone else tried to beat you up and shoot pistols at you - because that dude would do some serious damage if left unattended (like 13-17 points often, and you'd have about 60hp)