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NCSTAR VISM Upper Receiver Block for AR-15. A maintenance accessory that clamps onto the AR-15 upper receiver to support and secure it during maintenance and assembly tasks. Blue anodized aluminum block; halves bolt together to support the inside and bottom of the receiver; keeps optics rail accessible for mounting accessories; includes bore brush guide hole for cleaning the barrel. US Patent D870840.
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A comprehensive overview of every major component in an AR-15 build—including what's inside bolt carrier groups and parts kits—organized by assembly for new builders.
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