Zeluga 877-337 885-827A Aluminum Magazine Spring Set for NR83 NR83A & NR83A2 Framing Nailers. It provides the necessary tension to feed nails into the firing mechanism of the roofing nailer. Designed to exert consistent pressure on the nails as they are pushed toward the front of the nailer. This makes the nailer to achieve a high rate of continuous nailing without interruptions. Minimize downtime by preventing jams, misfeeds or other issues related to the feeding of nails.