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If you choose quality parts and are careful during assembly you don't have much to worry about, it's not difficult to build a better rifle than the cheap ARs that litter most gun shops. Just know what you want and buy quality. Kabooms are rare and feeding problems aren't likely unless you buy inferior parts or magazines.
Most people buy a preassembled upper unless they want to invest in the necessary tools. The lower receiver is not hard to assemble using common tools.
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