Original Makita replacement arm — part number 345987-2 — designed for the GN900-series gas framing nailers. This is the lever/arm piece that pivots in the nose assembly and engages the contact/firing mechanism so the tool will drive properly; it is listed as item 11 in the GN900 parts diagram.
Made to the original Makita specification and sold as a single arm assembly, it installs on the GN900/GN900SE family and matches the factory exploded view for those models.
Fitment note: this arm is used with the GN900 nose components (the arm plate and contact top) and is secured with the hex socket head bolt M5×10 shown in the parts list — check that bolt and retaining hardware when you replace the arm.
If your GN900-series nailer has a bent, cracked, or worn lever that’s causing misfeeds or failure to fire, this original Makita 345987-2 arm is the direct replacement specified in the parts diagram and will restore the correct nose/trigger action when fitted.
Jump straight to the Makita spare parts diagrams:
