Some states require it.
Not always
Advanced ammunition casings, gatling guns, mini balls and other things
US cents were never made out of rifle casings themselves, but they were made from shell casings during 1944 and 1945. These coins were of course called "shell-casing cents".In 1943 the Mint struck cents in plated steel to save copper for use in ammunition. The steel coins were unsatisfactory in almost every way - they were confused with dimes when new, after a while they either rusted or turned an ugly gray, they didn't always work in vending machines, etc., etc. As the war turned in favor of the Allies there was so much spent ammunition that the government was able to divert some of the scrap for use in coins, so starting in 1944 coinage of bronze cents resumed.
some are gonna be new guns
Because some states require test firing of newly manufactured guns before they can be legally sold (Mass. for one). It's nothing more than a simple proof of function. Regardless of what the "tin-foil hat mafia" wants you to believe. No state pays to have an electron microscope record bullet markings to be put into some secret file archive or database.
no
New guns have a better fire rate and have more attachments you can say. Old guns had horrible reloading and a lack of ammunition. New guns have enough and a good amount of ammunition.
In ferns, the spore casings are called sporangia. These structures are typically found on the undersides of leaves (fronds) and can be grouped together in clusters known as sori. When mature, sporangia release spores that can develop into new fern plants.
In semi and fully automatic guns it is a simple mechanical process. The magazine holding the rounds has a spring on the bottom of it. As the slide retreats back from the breech the empty shell is "sprung" out, the slide then closes back over the breech at the same time a new round is sprung up into place.
no it can not. the shell grows with it
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