THIS IS HUGE, comparing 6.01mm tightbore to a 6.08mm stock barrel/Polishing your barrel for more accuracy.

Probably a glitch. Nothing showed up in the staff section about deleting your post, so I highly doubt someone from the staff deleted it. Mods can't just delete any post they want, it has to be reviewed in the staff section first. Regardless, there would be no reason to delete such a post anyways. 90% sure a hiccup in the system.