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Dirty cylinder. Worn Bumper. O-rings worn in piston assembly. Disassemble and clean cylinder. Replace bumper. Purchase Bottom Repair Kit Replace piston assembly. On the NBSNC2x4 contact an *AWSC for correct part. All other nailers purchase Bottom Repair Kit. Weak Drive. Inadequate air supply. Worn piston assembly. Check PSI and CFM. Replace piston assembly. On the NBSNC2x4 contact *AWSC for correct part. All other nailers purchase Bottom Repair Kit. NBSNC2X4 leaving a 1/4” indention. Driver blad