Yes.... Many different manufacturers. I've used complete bolt carrier groups from Stag, Rainier Arms, DPMS and a AIM NIB complete bolt carrier group with the same 5.56 upper. Never a issue, a bolt would have to be out of spec or a chamber. Then it would be a manufacturers issue and they would correct the part bolt/chamber. If they are all within production spec and pass QC then very rarely is there ever a issue.