One of the best if not the best bcg on the marker - Sons of Liberty Gun Works SOLGW Scalper Bolt Carrier Group

Definitely well made and I like the fact that SOLGW actually test fires every single BCG that comes in as a part of their QA/QC of their components. And you can’t say BCM is better because they are made by the same company. The only other BCG that I like but it truly expensive is a Geissele.