The Mossberg 88TM/91TM Owner's Manual provides safety warnings, operation, maintenance, and parts information for these pump‑action shotguns.
This manual covers essential safety rules, including keeping firearms and ammunition out of children's reach and storing them separately. It explains the mechanical safety, barrel assembly, magazine capacity, loading, firing, unloading, and disassembly procedures, as well as cleaning and lubrication steps.
Additional sections detail sight adjustment, accessory barrels, choke tubes, pistol‑grip installation, heat‑shield service, warranty information, a parts list with exploded view, and general notes on safe firearm handling.
Move the safety button fully to the right to the “ON” (SAFE) position before cleaning.
Store firearms and ammunition separately, keep them out of children’s reach, and never store a loaded firearm.