I bought a used BCM upper and the bolt carrier doesn't have the white BCM lettering that I see on other BCM bolts. Does anyone know if they make/made them without the white lettering? Also, is there any other way to tell if it is actually a BCM BCG? I'm hoping the seller didn't pull a fast one on me and keep the BCM BCG and give me something cheaper. The gas key is properly staked. Thanks for your help. Wanna kill these ads? We can help!