Instructables

How do primers in ammo work? What are they made of?

Anyone here know a thing or two about gun ammo? Anyway, I have just been wondering on exactly how primers worked. This is how I made mine. "Sorry if I seem like a lot of questions) The Cartriage is a section of a copper pipe, the bullet is made from a fishing weight, the propellant is match powder. Since match powder does not go off with impact,I made the primer from a thumbtack, a strip of tin(can), and a roll cap(those red paper things that explode when you hit them with a hammer). The cap and the match powder hold the thumb tack in place. The strip of tin holds the roll cap. When the thumbtack is struck, the thumtack hits the roll cap cuasing it to create a small explosion. When the roll cap explodes, it ignites the match powder around it. This larger secondary explosion is the one that propells the bullet forward. It works on homemade automatics, the only thing is that the catriage gets stuck sometimes, it produces A LOT of smoke, it takes around a half a second for the match powder to ignite and to propel the bullet forward, and after a while, a layer smelly brown tar begins to accumulate in the barrel. Is this a bit simmilar to how primers work?

i was not able to make it. i stuck. can you make a video of this mechanism. plz.
f-225 years ago
ok, building it is easy enough, but find the right pipe to be used as a barrel that the cartridge fits inside is really hard
OMG first gun barrels now bullets.....you need a hobbie.....that isnt guns and blowing stuff up
This is my hobby now. Before, my hobbies used to be.. Coin collecting Bonsai trees Fossil collecting Rock collecting Sword collecting Building models of boats such as the S.O.S. Titanic Magic (tricks) Snow Boarding Electronics Then I got bored of all of them, so I decided to try something more extreme.
my old hobbies were.....making custom fireworks....burning things, blowing things up, gazing at fire, and making projectiles....then i matured and went into electronics.
LOL Two complete opposites. I originally acted REALLY mature for my age, then I thought "Why not have some fun?" Anyway, blowing up and destroying things is not the only things I do now, in my applied tech magnet class, I build a lot of really neat things such as machines that operate entirely on things such as mousetraps, and rubberbands, I WAS going to try to win in a competition known as "King of the Hill" I made it to my school finals but those softmores beated me. (Errr!)I'm a freshman anyway, but next year, I get to take inventions and electronics class.
I mean "Conquerer of the Hill".
jtobako7 years ago
the prussians tried to invade france with this tech, i think it was called a needle gun. biggest problem they had was that the needle got overheated and couldn't pierce the next round. when the pin/tack is part of the cartridge, it's called 'pin-fire' because the pin sticks out the side of the gun and is hit by the hammer. there's a couple of neat 2mm? revolvers built into men's jewelry rings using pin-fire systems. back to the question : ) yes, you got it. and all the problems that gunsmith's have been dealing with for hundreds of years. a primer is much more sensitive to impact than the main charge. the caps you are using are probably not fast enough or hot enough, plus the charge of match powder is very compact-the wave of flame/ignition can't travel fast enough threw the dense mixture. the smelly brown tar is what's left of the match powder that doesn't combust completely-black powder does the same thing and was one of the reasons for the move to smokeless powders (which leave less residue).
IlluminatedAntichrist (author)  jtobako7 years ago
Ah, I see! Thanks.