The Bolt and cause groups are new and don't interchange with the initial M240. The new internal areas are created by OOW to ensure that strict quality standards are achieved. So in case you are seeking one thing to show heads in the variety with, get the Ohio Ordnance Works https://andresbazee.isblog.net/barrett-firearms-m107a1-50-bmg-for-sal-an-overview-36355182