Forgot to add, I have sent three different AAC cans in to have this done. Two Mini4s and a SDN6. Took less then a week for each and they are all lighter and quieter.
Quieter ? I discussed with them a year and a half ago I guess, maybe longer ,and the would do the bravo thread and recore , they said it would lighten the sdn 7.62 and sdn 556 but they would not be as quiet
If they have the decibels back down I need to check into this