These Upper/Lower receiver sets are being sold as blemished because the uppers have some machining chatter marks. Will NOT affect functionality. See picture below for location of blemish
See chart below for safety and magwell engravingsSURFACE ENGRAVING SAMPLES:The upper rear lug will not fit completely into the rear pocket of the lower until the lower is completely machined and finished by the end user. All of the jigs that we offer will accomplish this. This also allows you to custom fit your upper and lower with no wobble.
Upper Receiver Specs: