One caution about this nailer that bares repeating. DO NOT REMOVE THE CYLINDER. Your gun has a plastic ring around the cylinder’s base that will break when you pull the cylinder.

O-ring rebuild kit for Senco SNII

Complete O-ring kit to rebuild the SN2 framing nailer
NOTE: This kit is different from the SNII Plus +
Includes schematic & O-ring reference sheet.
Free shipping in the US