✅ Heat treated tool steel 6150 - Rockwell hardness 50-52 ✅ Aerospace grade #2024 Aluminum piston ✅ Mechanically locked piston driver interface ✅ Compatible with Metabo HPT Hitachi ✅ NR83AA3 Clipped Head Framing Nailer ✅ NR83AA2 3-1/4" Clipped head Framing Nailer ✅ NR83AA4 3-1/4" Paper Collated Framing Nailer ✅ NR83AA5M 3-1/4 Inch Clipped Head Fram Nailer

