There will be no problem. A basic conversion requires a new barrel. You can also add an insert in the front of the magazine well. This is more to prevent a clip of .30-06s from being loaded. It may enhance feeding, I have one in my conversion, but others have reported that the insert is not necessary. If the replacement barrel is short chambered, the best way to finalize headspace is to use one of the pull reamer setups intended specifically for the job.