Game changer - Midwest Industries Upper Receiver Rod

Nice tight fit in all in-spec uppers and barrel extensions. This tool ensures gas port and front sight alignment. It also acts like a gauge in assembled guns.

I've been wrenching on ARs for over 30 years. This adds to what the Geissele Reaction Rod does by adding a sail that engages the upper receiver, keeping alignment during torque. The sail is removable but there is no reason to.

If you have a really tight barrel nut, use this and a clam shell together to keep from breaking the upper and/or the index pin. Lifesaver for gorillas!