Mossberg Maverick For 88, 91 Instructions Manual

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CAUTION: Before performing any further disassembly, take time to study how the internal
components are arranged inside the receiver.
DISASSEMBLY OF INTERNAL RECEIVER COMPONENTS
CAUTION: Pay special attention to the position of the bolt, bolt slide and action slide bar
assembly during this portion of the disassembly, as the parts must be in the same
relationship during reassembly.
Remove the cartridge interrupter from the ejection port side and cartridge stop from the opposite
side. (It may be necessary to tap the sides of the receiver lightly to release these parts) (Fig. 9).
Move the forearm/action slide assembly rearward so that the bolt assembly and bolt slide are
three quarters of the way rearward. When the bottom of the bolt slide is aligned with the
clearance cuts in the sides of the receiver, lift the bolt slide upward and out of the receiver
(Fig. 10).
Remove the bolt assembly by sliding it forward and out of the receiver assembly through the
barrel opening at the front of the receiver (Fig. 11-A).
→
→ 
						

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Pivot the front portion of the elevator upward out of the receiver (Fig. 11-B). Squeeze the two
arms, which form the open end of the elevator assembly together sufficiently to disengage and
remove the elevator from the receiver (Fig. 11-C).
Remove the forearm/action slide assembly by sliding it forward and off the magazine tube.
CAUTION: Field disassembly is now complete! The shotgun should not be
disassembled further for routine cleaning or maintenance. Further disassembly should
only be performed at an authorized Product Service Center or by a qualified gunsmith.
CLEANING AND LUBRICATION
With proper maintenance and care, your Maverick
® shotgun will  provide you with years of
dependable service. Your firearm should be inspected and cleaned periodically to insure that it
remains in good condition. Clean your firearm as soon as possible after use. This is especially
important if your firearm has been exposed to moisture. For maximum performance and
continued satisfaction with your shotgun, periodic cleaning and lubrication are essential.
Follow the instructions and use the equipment provided with a quality firearm cleaning kit.
Always be sure that the safety button is in the “ON” (SAFE) position (Fig. 2) and
that the firearm is unloaded before cleaning or lubricating your shotgun. Wear eye
protection during cleaning.
Normal use requires only that the mechanisms be free of excessive shooting residue. Very little
lubrication other than a light oiling of external surfaces to prevent rust is needed. 
						

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If the firearm is to be stored for a long period of time it should be thoroughly cleaned and oiled.
Do not plug barrel or store in a fabric lined case that will absorb  lubricant from the gun.
Scrub bore and chamber with solvent and follow with cleaning patches until barrel is clean. A
final pass with a lightly oiled patch will provice a protective coating. Clean and remove any
deposits in the barrel extension.
All metal parts should be cleaned with gun solvent and lightly lubricated with gun oil. Over
lubrication should be avoided. Use only lubricants specifically designed for firearms. Avoid the
use of abrasives which may damage the metal finish.
Be sure not to leave cleaning patches or excessive oil or grease in the bore as they
can create dangerous obstructions, resulting in damage to the firearm and/or serious
personal injury.
Camo guns: Caution should be exercised to avoid exposure of camouflage pattern to strong
solvents.
BOLT AND TRIGGER HOUSING ASSEMBLIES
The bolt and trigger housing assemblies are complex assemblies and should not be
disassembled except by a factory authorized Product Service Center, or qualified gunsmith.
Clean as complete assemblies with gun solvent and lightly lubricate with gun oil.
ASSEMBLY OF INTERNAL RECEIVER COMPONENTS
Place the receiver with the trigger housing opening upward on a clean surface.
Slide the forearm assembly onto the magazine tube while guiding the action slide bars into the
corresponding cuts in the front of the receiver (Fig. 12).
Assemble the elevator by squeezing the arms together sufficiently to position them in the
receiver so that the buttons on the elevator fit into the corresponding (1/4 [6.4 mm]) diameter
holes in the receiver (Fig. 11). 
						

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Pivot the elevator so that the forward portion of the elevator is even with the outside edge of the
cavity in the receiver.
Insert the rear of the bolt assembly, with its bolt lock downwards toward the front inside top of the
receiver, into the barrel opening of the receiver. Depress the ejector (located in the side of
the receiver opposite the ejection port) to allow the bolt assembly to slide fully rearward into the
receiver.
The ejector must fit into the corresponding slot in the bolt (Fig. 11).
Push the elevator down until it rests against the bolt. Position the rear of the bolt assembly even
with the rear of the clearance cuts in the sides of the receiver (Fig. 13- B
 ).
Position action bars so the notch on the bar is even with the cuts on the inside receiver wall
(Fig. 13- A
 ).
The bolt slide should be positioned with the slotted side facing up, with notch to the rear
(Fig. 13-1).
Assemble the bolt slide, lowering the front of the bolt slide first, the bolt slide protrusion fits into
the corresponding cut on the bottom of the bolt lock and action bar slots (Fig. 13-1). 
						

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Hold the bolt slide down and pull the forearm assembly forward. The bolt and bolt slide should
move freely in their cuts in the receiver. If parts do not slide easily – DO NOT FORCE –
disassemble and reassemble, paying attention to the relationship of the bolt, bolt slide and
action slide bars.
Position the cartridge stop and cartridge interrupter in their proper places on the inside walls of
the receiver (Fig. 9).
The hooks must face inward toward the center of the cavity away from the receiver walls.
TRIGGER HOUSING ASSEMBLY INSTALLATION
NOTE:Hammer must be in the fully-cocked position to allow the trigger housing to be
inserted in the receiver.
Hold the cartridge stop and cartridge interrupter in place firmly against the receiver walls with
one hand and grasp the trigger housing assembly with the other (Fig. 9).
Insert the lugs, on each side of the front corner of the trigger housing into the slots on each side
of the receiver (Fig. 14), then ease the rear of the housing assembly down and into position
(Fig. 14). DO NOT FORCE!
NOTE: If the trigger housing does not fit into place easily, check that all internal trigger housing
pins are flush with the side of the housing and that the cartridge interrupter and cartridge
stop are positioned properly.
Align the trigger pin hole in the housing asembly with those in the receiver. Insert the trigger
housing pin and push in fully until flush with the side of the receiver (Fig. 14).
Fig. 14
 
						

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FUNCTION TESTING
AFTER PERFORMING ANY WORK ON YOUR FIREARM SUCH AS CLEANING,
DISASSEMBLY OR INSTALLATION OF AN ACCESSORY:
a. Move the safety button fully rearward to the  “ON” (SAFE) position and keep
muzzle pointed in a safe direction.
b. Open the action, visually and physically check chamber, elevator and magazine
tube to be certain the firearm is unloaded.
Depress and hold the action lock lever (Fig. 3). Open and close the action several times to check
for free movement of the action assembly.
Close the action (forearm fully forward) and leave the safety in the “ON” (SAFE) position. Pull the
trigger rearward fully. The hammer should not fall (No Fire).
Remove your finger from the trigger. Move the safety to the “OFF” (FIRE) position.The hammer
should not fall (No Fire).
Leave the safety in the “OFF” (FIRE) position.
Pull the trigger rearward. The hammer should fall (Fire).
Open the action by moving the forearm fully rearward. Move the safety fully to the right to the
“ON” (SAFE) position.
IF YOUR FIREARM DOES NOT PERFORM AS DESCRIBED IN ANY OF THE
ABOVE STEPS, CONTACT THE AUTHORIZED PRODUCT SERVICE CENTER
IMMEDIATELY. DO NOT ATTEMPT TO USE THE FIREARM.
SIGHT ADJUSTMENTS - RIFLE SIGHT BARRELS
BEFORE MAKING ANY SIGHT ADJUSTMENTS:
a. Move the safety button fully to the right to the  “ON” (SAFE) position and keep
muzzle pointed in a safe direction.
b. Open the action, visually and physically check chamber, elevator and magazine
tube to be certain the firearm is unloaded.
RIFLE SIGHT ADJUSTMENTS
Folding Style rear sight:
Elevation may be adjusted by loosening the small screw in the center of the rear sight leaf. This
will allow the sight blade to be moved upward or downward as required.
Windage may be adjusted by moving the rear sight base to the left or right in the dovetail slot in
the barrel. Place a wooden dowel or other object that will not damage the finish, against the side
of the sight base. Tap the dowel with a hammer until the desired sight location is achieved. 
						

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Williams Style rear sight:
Elevation may be adjusted by loosening the smaller of the two screws on the rear sight leaf
base. This will allow the sight leaf base to be raised or lowered by sliding the base up or down the
rear sight ramp. Tighten screw after adjustment.
Windage may be adjusted by loosening the larger of the two screws and sliding the sight leaf left
or right in the sight leaf base. Tighten screw after adjustment.
Remember: Move the rear sight in the same direction you would like the shot to move. For
example, if the point of impact is low and left of the point of aim, move the rear sight upward and
to the right.
ACCU, ACCU-STEEL CHOKE TUBES
BEFORE REMOVING OR INSTALLING ANY CHOKE TUBE:
a. Move the safety button fully to the right to the  “ON” (SAFE) position and keep
muzzle pointed in a safe direction.
b. Open the action, visually and physically check chamber, elevator and magazine
tube to be certain firearm is unloaded.
Do not use bent or deformed tubes as these may result in tube or barrel damage or
personal injury upon firing. Inspect tubes periodically to insure they are properly
installed and in good condiiton. Pay special attention to the threaded end of the tube to
be certain it is not deformed or dented.
Never fire the shotgun without a choke tube properly installed. Failure to do so will
damage the precision threads on the inside of the barrel, and may cause damage to
the barrel and personal injury.
CARE & CLEANING: The precision threads on your choke tube should be kept clean and lightly
oiled at all times.
During cleaning of the barrel, be certain a choke tube is properly installed. This will avoid residue
build-up on threads.
The “Improved Cylinder” choke tube will produce the best accuracy with most slugs.
ACCU CHOKE TUBES
(88™ MODELS ONLY)
ACCU-CHOKE TUBES - are designed for Best Lead Shot Patterns. STEEL SHOT
can be fired through Accu-choke tubes however, better steel shot patterns may be
obtained by using ACCU-STEEL choke tubes.
To  remove choke tube, loosen it with the choke wrench provided, turning counterclockwise.
When loose, remove completely with fingers, put choke on a clean dry surface.
To  install choke tube, first screw the tube clockwise into barrel by hand and then tighten the tube
until snug with a choke wrench. Do not use excessive force when installing. Tube tightness
should be checked periodically. Accu tubes fit competely inside the barrel when fully installed. 
						

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ACCU CHOKE TUBES
GAUGE ITEM # LEAD SHOT  PATTERNS
12 95190 Full
12 95195 Modified
12 95200 Imp. Cylinder
12 95235 Skeet
12 95267 XX Full Turkey(lead only)
12 95245 Improved Modified
ACCU-STEEL™ CHOKE TUBES
(88™ MODELS ONLY)
ACCU-STEEL TUBES - have been specifically designed for exceptional endurance and
controlled patterning of steel shot.
These tubes will provide the best pattern results for the steel shot sizes stamped on each tube.
Lead shot may be used with ACCU-STEEL tubes; however, pattern tests should be made to
compare the pattern change.
To  remove choke tube, loosen with a choke wrench provided, turning counterclockwise. When
loose, remove completely with fingers, put choke on a clean dry surface.
To  install choke tube, first screw the tube clockwise into barrel by hand and then tighten the tube
until snug with a choke wrench. Do not use excessive force when installing. Tube tightness
should be checked periodically.
ACCU-STEEL tubes protrude beyond the muzzle and are designed specifically for steel shot.
Choke designations are marked on each tube for specific steel shot sizes.
ACCU-STEEL™ CHOKE TUBES
GAUGE ITEM # STEEL SHOT  PATTERNS
12 95110 Full forT,F,BB,#1,2
12 95115 Full for #4,6
12 95117 Extra-Full forT,F,BB,#1,2
12 95120 Modified for All Steel Shot Sizes
ACCU-MAG™ CHOKE TUBES
( 91™ MODELS ONLY)
ACCU-MAG choke tubes are internal, flush fitting choke tubes designed for use with LEAD and
STEEL shot.  Each durable tube is clearly marked, as a guide, with the lead and the steel shot
pattern it will produce.
To  remove  a choke tube from the muzzle of the barrel, loosen with the choke wrench provided,
turning it counterclockwise. When choke tube is loosened, remove it completely with fingers.
Put choke tube on a clean, dry surface.
To  install choke tube, screw the tube clockwise into the barrel by hand and then tighten the
tube until snug with choke wrench. These tubes fit competely inside the barrel when
properly  installed. Do not use excessive force when installing. Tube tightness should be checked
periodically. 
						

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12 GA. ACCU-MAG™ CHOKE TUBES (91™ MODELS ONLY)
ITEM # LEAD SHOT  PATTERN* YDS STEEL SHOT PATTERN YDS
95256 Skeet 40 Skeet 40
95252 Imp. Cyl. 40 Mod. T&F 40
95253 Modified 40 Mod. #2 & BB 40
95254 Full 40 Full, #2 & BB 40
95255 Extra Full T&F 40
95257 Ulti-Full 30
* Lead shot patterns will vary substantially with the extra-full steel shot tube depending on shell
length, shot size, brand of ammunition and the individual barrel. The shooter is urged to conduct
lead shot pattern tests with this tube before field use.
SLUGS: Overbored 91 Model  Accu-Mag barrels are designed for lead or steel pellet
shot loads only. We specifically disclaim any responsibility for damage or injury
resulting from firing slugs (single projectile ammunition) through overbored barrels.
Use only 91 Model barrels designed specifically for slug shooting.
ACCU-MAG, 
LEAD SHOT, ULTI-FULL TUBE
The NATIONAL WILD TURKEY FEDERATION has determined that the average distance
at which turkeys are most effectively taken, under average environmental conditions and
surroundings is 30 yards.
Subsequently Mossberg designed and manufactured this highly specialized choke tube for #4
or #6 lead shot to yield a high core concentration and high pellet count in a 20 inch circle at 30
yards. Shot patterns at distances greater than 30 yards will be less dense.
These special purpose “Turkey Tubes” are specifically designed for use with Lead Shot loads
only.
Do not shoot steel shot through Extra Full turkey tubes as it may result in barrel
damage.
Test results are averages and individual shotgun performance may vary. We recommend
pattern tests with several brands of ammo and at various distances to familiarize yourself with
your shotgun’s performance at various distances.
PISTOL GRIP INSTALLATION
BEFORE PERFORMING ANY DISASSEMBLY OR ASSEMBLY PROCEDURE:
a. Move the safety button fully to the right to the  “ON” (SAFE) position and keep
muzzle pointed in a safe direction.
b. Open the action, visually and physically check chamber, elevator and magazine
tube to be certain the firearm is unloaded.
To Remove Buttstock:
1) Loosen the top screw holding the recoil pad or buttplate on stock. Note: Most models use
Phillips head screws.
2) Loosen and 
remove the bottom recoil pad or buttplate screw. 
						

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3) Swing the recoil pad or buttplate around the top screw which will allow access to the stock
bolt through the stock butt hole.
4) Check stock bolt head configuration. Some models use a slotted head, others use a 1/2 in.
hex head.
5) Loosen and remove stock bolt by turning it counterclockwise. The stock may now be
removed from the receiver.
Installation of Pistol Grip:
1) Align mounting hole in pistol grip with threaded hole in rear of the receiver.
2) Slip washers on bolt. Insert bolt through pistol grip into hole in receiver. Finger tighten bolt
to insure threads are properly engaged. If you encounter difficulty, unscrew both and
repeat procedure.
3) Using Allen wrench supplied, tighten bolt very snugly.
Upon firing, recoil force will cause the shotgun to move rearward and upward. Never
hold the shotgun at eye level and attempt to sight down the barrel. To avoid possible
injury, grip the shotgun securely with one hand on the forearm and one hand on the
pistol grip. Pistol grip models are designed to be held at waist level when firing.
HEAT SHIELD
BEFORE PERFORMING ANY DISASSEMBLY OR ASSEMBLY PROCEDURE:
a. Move the safety button fully to the right to the “ON” (SAFE) position and keep
muzzle pointed in a safe direction.
b. Open the action, visually and physically check chamber, elevator and magazine
tube to be certain the firearm is unloaded.
HEAT SHIELD INSTALLATION
NOTE: The heat shield can only be installed on 12 ga., plain barrel models.
1) Follow barrel removal procedures as described in this Owner’s Manual.
2) Carefully remove front sight by turning it counterclockwise. Take precautions to insure you
do not damage the barrel finish.
3) Slide heat shield onto barrel from muzzle end. Large ring on heat shield is positioned
towards rear of barrel.