I was speaking with Daniel at KKM Precision today while ordering a couple of barrels. We got into discussion about suppressors and wait time. He told me that he ordered his suppressors from a shop that had a range. That way, he was allowed to go in and use them while he was waiting for his stamp. He said not all shops would do that but technically you own it and rules say you can't leave the stop with it. Using it in the store was not prohibited. Just a FYI.