Hello everyone, I was recently researching on the topic of the differences between M16 and AR-15 general receiver parts, and while I have found out that M16 bolt carrier groups differ from AR-15 ones, I could not find any info on the difference of the bolt-head, maybe someone here knows. So basically, is there any difference between an M16 bolt-head and an AR-15 bolt-head? Say as an example, I have an M16 bolt head, would that fit into an AR-15 bolt carrier group? And vice versa? Thank you.