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If you're military then you've broken down the M16/M4, cleaned and reassembled many times. I know putting together a lower is a little more than the military allows most troops do but still, it should be a piece of cake. Many of us have the necessary tools in the garage.
Now the upper requires extra tools but most people buy a barreled upper to avoid those installation issues.
So far I haven't run into any major issues with my "custom" ARs. Most folks don't either.
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