Operating and Safety Manual

CLEANING THE UPPER RECEIVER…
29
1. Using a “CLP“ type product, clean all areas (inside and out) of Powder Fouling, Corrosion and Dirt.
Never use a wire brush or any type of abrasive to clean the Aluminum Upper Receiver or
Bearing Rails - you’ll scratch and damage the finish. A Toothbrush is good for loosening any
dirt buildup, and won’t scratch the Receiver.
2. Wipe all components clean and dry, and inspect for excessive wear, corrosion or mechanical
damage. Have a qualified Gunsmith replace any worn or defective parts before firing again
(or contact Bushmaster at 1-800-998-7928 for parts needs.)
1. Clean and inspect Bolt, Cam Pin, Firing Pin, Firing Pin Spring, Firing Pin Retaining Pin and
Action Spring Assembly thoroughly.
CHECK THE BOLT: Look for cracks or fractures, especially in the Cam Pin hole area. Inspect
Bolt Face - Bolts with any pitting extending into the firing pin hole should be replaced.
CHECK THE CAM PIN: If it is cracked, or chipped, it should
be replaced. NOTE: Cam Pin can only be installed in Bolt
from one side - so Ejector will be positioned correctly.
CHECK THE FIRING PIN: If it is bent, cracked, too blunted
or too sharp, it should be replaced.
CHECK THE FIRING PIN RETAINING PIN: If it is bent, or badly worn, it should be replaced. If
O-ring is broken, worn or missing it should be replaced, though the Firearm will still function safely.
WIPE ALL PARTS DRY BEFORE REASSEMBLING BOLT CARRIER. WARNING: IF THE
CAM PIN IS MISSING, DO NOT FIRE THE FIREARM – IT COULD MALFUNCTION CAUSING
PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
CLEANING THE BOLT, BOLT CARRIER & COMPONENTS...