If you have any doubts in your ability to perform the following actions, stop immediately and seek assistance from a qualified gunsmith. If you need clarification on any of the steps below, please contact us to speak with a company representative.

Assembly overview

The 0940 receiver from Angstadt Arms is designed to be similar to a standard AR-15 lower receiver with assembly being almost identical to that of any other mil-spec lower. However, small assembly differences due exist and we have therefore provided additional documentation for those aspects below.

Detailed instructions

Installing a bolt catch in your lower receiver