Brownells .22 Cal/.223 Remington/5.56x45mm 5/16-27 Male 4" Receiver Brush

Efficiently clean heavily fouled AR-15 upper receivers, including the locking lug recess. The specially designed and shaped bronze receiver brush effectively loosens stubborn carbon residue from the bolt carrier way and the locking lug recess. Receiver brush with bronze bristles Male threads with a 5/16-27 unified national special (UNS) specification