
Users Manual
Model 321
621
Mossberg Tactical Light
Mossberg Model 500
(14 inch barrel length)
Protected by US. Patent 4,856,218
Revision B 6-1-98

Model 321& 621 Mossberg Tactical Light
Introduction
The Model 321 & 621 Tactical lights provide a rugged and reliable source of high intensity light that is integrated into the
fore-arm of the shotgun. The lamp is shock isolated & can be activated by pressing the Pressure Switch along the right side
of the fore-arm. A switch blocker is provided for users that want to reduce the functional size of the Pressure Switch.
Kit Contents
! H21 Housing
! L30 or L60 Lamp Module
! DL123A or DL223AC Battery
! Installation Tool
! Model Z10 Switch Blocker
! Alcohol Wipe
! Users Manual
Installation
1. Put safety on safe. Open action and make certain no shells remain in chamber
or magazine. Close action and remove Barrel. Remove Fore-End Tube Assembly
from Magazine Tube.
2. Unscrew and remove Fore-End Tube Nut using Installation Tool supplied in Kit.
3. Remove Wooden Fore-End by pulling straight off the Fore-End Tube.
4. Slide H21 Housing on to Fore-End Tube.
5. Reinstall Fore-End Tube Nut using Installation Tool.
6. Install Fore-End Assembly on receiver. Reassemble Barrel and tighten firmly
with Magazine Cap.
7. Install Battery into the Housing with the + contact facing out.
8. Install Lamp Housing into H21 Housing.
9. Apply finger pressure to the pressure sensitive Tape Switch on the right side
of the Housing. The light should come on. Installation is now complete.
Lamp Replacement
1. Unscrew Bezel from Lamp Module. Lift Lamp Assembly out of Bezel.
2. Install replacement Lamp Assembly in Bezel and reassemble by screwing
onto Lamp Housing until it is fully seated.
Battery Replacement
1. Unscrew Lamp Module from Housing and shake out old battery.
2. Install new battery with the + terminal facing out.
3. Reinstall Lamp Module.

Model 321& 621 Mossberg Tactical Light
Switch Blocker Installation
If you want to disable the part of the pressure switch where you rest your hand, (and don’t
want the light to come on) you can cover it with the Model Z10 Switch Blocker. First clean the
portion of the Pressure Switch to be disabled using the Alcohol Wipe from the Kit. Then
remove the paper backing from the underside of the Switch Blocker and press the Switch
Blocker in place on the Pressure Switch.
WARNING
Lithium batteries can explode or cause burns if disas-
sembled, shorted, recharged or exposed to fire or high
temperatures. Please handle with care.

Model 321 & 621 Mossberg Tactical Light
Caution
The battery used in the light is very powerful. Be sure that the switch is not touching anything
when the light is stored. If the lamp is turned on while in a case or other container, the lamp can
overheat and damage the light or surrounding materials. Remove the battery or unscrew the bezel
far enough to prevent the lamp from turning on when stored.
Do not use a 3 Volt Lamp in a 6 Volt system. The lamp will BURN OUT immediately!!! To
identify a lamp assembly: the 3 volt lamp has a Red label and is marked R30, the 6 volt has a
Blue or Green label and is marked R60 or P60.
If it is necessary to dispose of any batteries, do not do so by fire, mutilation or by disassembly,
as this may cause toxic chemicals to be released.
Repairs & Replacements
To obtain repair or replacement call Customer Service at 800-828-8809 (toll free) or 714-5459444 and obtain a Return Authorization number (RA). Then pack the unit carefully and return (no
COD’s please) to:
Sure-Fire LLC
Repairs Department, RA ____
18300 Mt. Baldy Circle
Fountain Valley, CA 92708
Sure-Fire LLC will pay any reasonable shipping costs to return the unit to you.
Warranty
Sure-Fire LLC warrants that its products will be free from defects in materials and workmanship.
Sure-Fire LLC will repair or replace (at its option), without charge, any product or part which is
found to be defective under normal use and service. Such repair or replacement shall be the
purchaser’s sole and exclusive remedy under this warranty. This warranty does not include normal
maintenance and services and does not apply to any products or parts which have been subject to
modification, misuse, negligence, accident, improper maintenance or repair by anyone other than
Sure-Fire LLC.
“Fine Print” Warranty Limitation
There is no other express warranty. Sure-Fire LLC hereby disclaims any and all implied
warranties, including, but not limited to fitness for a particular purpose. Sure-Fire LLC shall not be
liable for incidental, consequential, or special damages arising out of, or in connection with product
use or performance.
um_H21_8.601 71-01-456