We have tested numerous of these 80% Lower Receivers and have confirmed that the front pivot pin hole was machined off center, the magazine catch button seems to be too tight & the bolt catch channel needs to be machined more. These Lowers need work in order to function as intended, these are the only issues we have confirmed with these 80% Lowers.

This is not a complete receiver and still requires machining to be done in order to have an operational firearm.