There was a batch that didn't have the inside coating of the tube quite right, and some of that coating broke off.
They were extremely small but showed up when against magnification.
Didn't have this problem with anything till I jumped to the Improved Lapua case.
I have had similar flecks in some Burris' before as well.
If you have doubts about any product I would advise you to not purchase it, since you do not have confidence in it.
If you are still in search mode then give them a call and talk to them about their warranty.
Ernie (xphunter) "The Un-Tactical"