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The NBS Slick Side Billet Upper Receiver is a quality, American made billet upper featuring a unique design that sets it apart from traditional forged upper receivers. Manufactured to exacting standards on five axis CNC machines from a solid block of aircraft grade aluminum, this stripped upper not only looks good… it is built to last. M4 Feedramps Compatible with mil-spec forged lower receivers and most billet lower receivers .250 takedown / pivot pin holes No forward assist