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My son bought one of ARP's 6.8 SPC 16" uppers a couple of years ago. It's a great shooter...accurate and reliable.Does anyone know anything about this company? Are their uppers any good? Specifically the challenger. This is my first build and i don't want to buy any junk but my pockets aren't very deep. So i need something decent and at a good price. Any suggestions would be appreciated. Thanks