Bolt carrier won't fit! defective upper - Ammunition Storage Components AR15 Billet Slick Side Upper Receiver

This receiver is beautifully machined outside, with clean lines and a great design. Unfortunately, the inside isn't machined and milled properly, or the nitride coating was slapped on super thick, as not a single bolt carrier group will fit inside it. Halfway in they jam. I have heard the same about NBS uppers that look exactly like this one (probably just rebranded but the same OEM). This is a one star or lower item, as it will NOT FUNCTION. Didn't find out for months as I didn't get around to building right away. Stay away from ASC products! Defective!