AR-15 question
How well do uppers and lowers from different manufactureres match up? I have a Bushy and I'm looking for an upper and there are a few out there that I like but they're from different manufacturers. Help?
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USAF Retired 
Far better is it to dare mighty things, to win glorius triumphs, even though checkered by failure... than to rank with those poor spirits who neither enjoy nor suffer much, because they live in a gray twilight that knows not victory nor defeat.
Theodore Roosevelt
Don't sweat the petty things and don't pet the sweaty things
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