Every individual make and model of rifle requires a unique set of cleaning tools. Illustrated is a cleaning set for the popular 5.56 M-16 type rifles available in the United States. Yeah - you need all this stuff, plus soft flannel patches. This rifle and the 5.56 cartridge are not favorites of mine. These semi-auto rifles require meticulous care and cleaning or they will not function properly. They must be cleaned after every firing session.
There is argument as to whether or not the barrels should be "broken in". It can't hurt. Get some copper solvent (such as Hoppes #9), fire one round and let the barrel cool. Clean. Then cool and clean after every two rounds for the next ten rounds. Then cool and clean after the next three rounds for the next nine rounds.
Generally, the barrel will "shed" and you should clean immediately after a range session and a day later.
Purchase a bore-guide, used nylon bristles and always run the brush ONLY from the breech to the end of the barrel. Never the other way around.
I do not recommend purchasing a used rifle, because more often than not the bore has been damaged, which will prevent the weapon from every achieving top-notch accuracy. The most common cause of damage is by running a steel bore-cleaning rod down the front of the barrel, damaging the edge of the bore at the top of the barrel. Unless you are an expert you will not be able to evaluate such damage.
There are many excellent guides to cleaning specific rifles available on the internet. The job is messy and is best done outdoors, preferably before leaving the range.
If you consider purchasing a complex rifle, remember that if it is submerged in water or fired it will have to be disassembled, cleaned and put back together. There can be a lot of springs and small parts and specialized brushes and tools are required. Learning how to take the rifle apart and put everything back together should be on your list of "things to learn".
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