Terrible machining - CMMG ZEROED .750in ID Adjustable Gas Block

I rated this gas block at 3 stars, which is generous, simply because it does what it's supposed to and is adjustable. However, the machining and QA was terrible, with multiple large burs left on the inside of the gas block. I did not realize this until I tried to put it on my barrel and it completely tore up the barrel. I've never had this issue with a gas block before and am extremely disappointed in the quality of workmanship.