300BlkTalk

I have an Ares Armor upper and an Ares Armor chrome bolt and carrier, aside from the Bcg and bolt that came with the upper. If I wanted to swap the entire chrome BCG group, would I need to headspace?

This is old for the OP but I have found good results with the 200 gr bullets in 45 ACP. Lee makes a close copy of the old H&G that would work well.