Mossberg International SA-2 User Manual

OWNER’S
MANUAL

20 GAUGE
AUTOLOADING
SHOTGUN

IMPORTANT “SAFETY WARNINGS” — NOTE THE SYMBOL

THESE SAFETY WARNINGS ARE FOR YOUR PROTECTION AS WELL AS
THE SAFETY OF OTHERS. DISREGARDING INFORMA
MANUAL MAY RESULT IN SERIOUS INJURY OR DEATH.

Be certain this owner’s manual is available for reference and is kept with
this firearm if transferr
misplaced, contact The Product Service Center for a free replacement
copy.

After performing any work on your firearm such as cleaning, adjustments,
disassembly, or installation of any accessory, the firearm should be
re-checked for proper functioning before firing live ammunition.

ed to another party. If the manual is lost or

TION IN THIS

Firearms are complicated mechanisms. Any modification, alteration, or
improper fitting of parts may result in a dangerous malfunction, damage
to the firearm and injury to the shooter and others. The firearm’s
owner must accept full responsibility for the correct reassembly and
functioning of the firearm after any disassembly or replacement of parts.

If you do not understand any of the material in this manual or have any
questions, contact Mossberg International or a qualified gunsmith.

Do not attempt to load or use any firearm until you have read and
understood the information contained in its owner’s manual. Before
handling your firearm, you should learn how it operates and how to
maintain it. This includes knowing its basic parts, how the manual
safety and other safety features operate, how to safely open and close
the action, and how to safely load and unload ammunition from the
firearm. Improper use and handling is dangerous and could cause serious
injury or death to you or those around you. All users of the firearm must
become thoroughly familiar with the instructions in this manual.

distributed by

MOSSBERG INTERNATIONAL, INC.

P.O. BOX 497 • 7 GRASSO AVENUE, NORTH HAVEN, CT 06473

Safety and safe firearms handling is everyone’s responsibility.

PHONE [phone]
www.mossbergintl.com

As the owner of a firearm, you must undertake the full-time responsibility
of safe fir
around you:

Always point the muzzle of your firearm in a safe direction, regardless
of whether the firearm is loaded or unloaded.

Always treat every firearm as if it were loaded. Give your firearm to
someone with the action open (bolt fully rearward) and safety in the “ON”
(SAFE) position, after you verify the firearm is unloaded. Insist on the
same procedure when receiving a firearm from someone else. Learn the
location of all the safety features of your firearm and how they operate.

Wear eye and ear protection when shooting. Shooting without proper
ear protection can cause hearing damage. The use of eye protection
during any type of shooting is important to protect your eyesight.

Due to the heavy recoil of a shotgun, maintain an adequate distance
between the rear of the scope (if equipped) and your face at all times.
Be certain the scope installation does not interfere with access to, or
the proper functioning of the safety.

WE SPECIFICALLY DISCLAIM ANY RESPONSIBILITY FOR DAMAGE
OR INJUR
AS A RESULT OF, THE USE OF FAULTY, OR NON-SAAMI STANDARD
OR “REMANUFACTURED,” OR HAND-LOADED (RELOADED)
AMMUNITION. ADDITIONALLY, WE DISCLAIM ANY RESPONSIBILITY
FOR DAMAGE OR INJURY WHICH RESULTS FROM ANY
MODIFICATIONS OR CHANGES THAT ARE NOT A PART OF THE
FIREARM AS DELIVERED FROM THE FACTORY.

Learn to clean your firearm thoroughly and make certain no oil, grease,
or other materials are blocking the barrel. Obstructions of any kind can
cause damage to the firearm, and may result in serious personal injury
to the shooter and/or others nearby

Practice proper firearm maintenance and safety. Make sure all exposed
metal surfaces are coated with a thin film of oil, especially after exposure
to damp weather. (See proper section of this manual for cleaning instructions).
Do not plug barrel or store in a fabric-lined case which will absorb
lubricants from the firearm. Before using after storage, follow complete
instructions stated in this manual for refamiliarization with the firearm. A
thorough inspection and function test should be performed before going
into the field. Have your firearm periodically checked by a qualified
gunsmith.

earms handling for your own safety and the safety of those

• Keep all firearms and ammunition out of the reach of children.

• Store your firearms and ammunition separately.

• Never store a loaded firearm.

• Never leave a loaded firearm unattended.

• Never transport a loaded firearm in a vehicle.

• Unload your firearm when you have stopped shooting and when
you have to climb a tree, fence, cross a slippery surface or have
to transport it in a vehicle.

• Do not load your firearm before you are in a place where it is
safe to shoot, and keep your finger off the trigger until you are on
target and have decided to fire.

• Never shoot at water, rocks or any hard surfaces. Shots may
glance off such surfaces and cause injuries.

• Do not use alcohol or drugs before or while handling firearms.

• Do not touch the trigger while the safety button is being
engaged or disengaged.

Y WHATSOEVER OCCURRING IN CONNECTION WITH, OR

.

PART NO. 18478 REV. B

A note about the warnings and information contained in this Manual:

We strongly suggest that you check with your local licensed retailer or state
police for additional information concerning firearms ownership, or hunting or
target shooting rules that may be required by local law or regulation. Since such
rules and regulations are subject to change, local authorities are in the best
position to advise you on such matters.

TABLE OF CONTENTS

Page

The Mechanical Safety........................................................................ 4

Ammunition Specifications ................................................................. 5

Unpacking and Assembling Shotgun ................................................. 6

Magazine Capacity.............................................................................. 7

Magazine Plug..................................................................................... 7

Removing the Magazine Plug ............................................................. 7

Loading ............................................................................................... 9

Load Magazine.................................................................................... 10

Firing The Shotgun.............................................................................. 11

Unloading ............................................................................................ 12

Disassembly ........................................................................................ 13

Assembly............................................................................................. 15

Removing and Reinstalling Choke Tubes ........................................... 16

Choke Tubes Information.................................................................... 17

Cleaning and Lubrication .................................................................... 18

Stock Spacer System ......................................................................... 20

Service Instructions............................................................................. 21

ranty Infor

War

Function Testing .................................................................................. 23

Notes................................................................................................... 24-25

Part List............................................................................................... 26

Exploded View .................................................................................... 27

The Basic Rules of Safe Fir

mation........................................................................... 22

ms Handling

ear

................................Back Cover

PERATING INSTRUCTIONS

O

MECHANICAL SAFETY

Read and understand this entire manual and its safety warnings before
handling the firearm.

The safety button is located at the rear of the trigger guard (See Figure 1a and 1b)
and must be manually moved to the desired position by the shooter.

To put the safety in the “ON” (SAFE) position, the safety button must be pushed
from the left side (side opposite the ejection port) so that it moves all the way to
the right. The button must always be pushed fully to the right until it moves no
further to be in the “ON” (SAFE) position. (See Figure 1a).

The safety button is designed to function only as described above and
should not be reversed. Do not attempt to remove or reverse the safety
button. Doing so will result in an unsafe condition which can cause
serious injury or death.

Remember, a firearm’s manual safety is a mechanical device which can
never replace safe firearm handling practices.

Never rely on any mechanical mechanism or safety device to prevent
the dangers of careless handling or pointing a firearm in an unsafe
direction.

SAFETY
BUTTON

PUSH IN FULLY TO THE RIGHT UNTIL THE

BUTTON MOVES NO FURTHER TO BE IN

THE “ON” (SAFE) POSITION.

e 1a

Figur

ON (SAFE) position

PUSH IN FULLY TO THE LEFT UNTIL

BUTTON MOVES NO FURTHER TO BE

IN THE “OFF” (FIRE) POSITION.

e 1b

Figur

OFF (FIRE) position

4

RED
SHOWING

AMMUNITION

USE ONLY SUITABLE AMMUNITION

This 20 gauge semi-automatic shotgun is chambered for 3 inch magnum shells.
It is designed to be used with factory loaded shot shells between 2 3/4" (15/16
oz) and 3" (1 /1/4 oz).

Use of re-loaded ammunition voids the One Year Factory Warranty.

Never shoot slugs with a full choke. Use only the most open (improved
cylinder) choke.

Never use shotshells with a case longer than the chamber, as this can
cause damage to the firearm and may result in serious personal injury
to the shooter and/or others nearby.

Never shoot steel shot with a full choke. Use only a modified, improved
cylinder or skeet choke tubes.

5

UNPACKING AND ASSEMBLING SHOTGUN

When shipped from the factory, the barrel is removed and packed separately in
the shipping carton. Before installing the barrel, visually and physically inspect
the barrel and receiver to ensure they are free of any excess oil, grease, or any
obstructions. Obstructions of any kind can cause damage to the firearm and may
result in serious personal injury to the shooter and/or others nearby.

MOUNTING THE BARREL TO THE RECEIVER

Remove the forearm by unscrewing the magazine cap (counter clockwise). Slide
the forearm off the magazine tube. Check that the gas piston is correctly
assembled in the gas cylinder portion of the barrel before mounting the barrel
to the receiver. Note the orientation of the gas piston (See Figure 2b). Mount the
barrel to the receiver by sliding the barrel into the receiver, with the gas cylinder
portion of the barrel on the magazine tube (See Figure 2a). Pull the operating
handle half way back to fully seat the barrel in the receiver (See Figure 2c).

Figure 2a

Figure 2b

Figure 2c

6

MOUNTING THE FOREARM

Pull back the operating handle. The action should stay open. Mount the forearm by
carefully sliding it over the magazine tube, and seating it into the receiver. (See
Figure 3). Screw the magazine cap onto the front of the magazine tube, finger-tight.

Figure 3

MAGAZINE CAPACITY

Five (5) 2-3/4" 20 gauge shotshells, Four (4) 3" 20 gauge shotshells (plus one in chamber).

MAGAZINE PLUG

You are responsible for complying with all laws regarding magazine capacity.
Your Autoloading Shotgun is supplied with a plastic plug inserted in the
magazine tube. It reduces the capacity of the magazine tube to two (2) shells.

REMOVING THE MAGAZINE PLUG

Move the safety button so it is fully protruding out of the right side of the
trigger guard and cannot be moved any further indicating the “ON” (SAFE)
position. Pull back the operating handle. The action should stay opened.
Visually and physically check the chamber, elevator and magazine tube to
be certain the shotgun is unloaded before removing the magazine cap.

Unscrew and remove the magazine cap. Push the magazine plug blocker down
with your finger and pull up the slanted end in a diagonal motion (See Figure 4).
Remove the magazine plug from the end of the magazine tube (See Figure 5).
Replace the magazine cap finger tight only.

Figur

e 4

7

Figur

e 5

INSTALLING THE MAGAZINE PLUG

Move the safety button so it is fully protruding out of the right side of the
trigger guard and cannot be moved any further indicating the “ON” (SAFE)
position. Pull back the operating handle. The action should stay opened.
Visually and physically check the chamber, elevator, and magazine tube to
be certain the shotgun is unloaded before installing the magazine plug.

Unscrew and remove the magazine cap. Insert the plastic magazine plug into the
end of the magazine tube. Insert the magazine plug blocker by pushing down on
the slanted end diagonally onto the end of the plastic magazine plug. After the
magazine blocker is in the magazine tube make sure it is sitting flat on the plastic
magazine plug to capture it in the magazine tube. Release pressure from the
magazine plug blocker. Replace the magazine cap finger tight only.

8

LOADING

Before loading, move the safety button fully to the right so it is protruding
from the right side of the trigger guard indicating the “ON” (SAFE) position.

uring loading, never allow fingers or any objects to contact the trigger.

D
Keep the muzzle pointed in a safe direction at all times.

Open the action by pulling the operating handle completely rearward
until it locks in the open position (See Figure 6).

Inspect the chamber and bore of the barrel for any obstruction, excessive
oil or grease. (The chamber is the rear portion of the barrel where
cartridge will be inserted.) Obstructions of any kind may result in damage
to the firearm and/or serious personal injury to you or those around you.

Do not load the shotgun until ready for use! Unload shotgun when
shooting has been completed! The safety button should always be
protruding fully from the right side of the trigger guard indicating the “ON”
(SAFE) position whether the firearm is loaded or not.

Check to be certain that the ammunition selected is the same type of
cartridge as designated on the right side of the barrel.

This shotgun is designed to fire 20 ga. shells ranging from 2-3/4" target
and field loads to 20 ga. 3" magnum shells.

If you wish to load the firearm with the maximum number of shells or fire single
shots, load the first shell through the ejection port located on the right side of the
receiver (See Figure 6). The shell can be inserted directly into the chamber or
placed on top of the elevator. Close the action by pressing the bolt release
(See Figure 7a). Be sure to keep fingers and other objects out of the ejection port.

FOREARM

Figure 6

The shotgun is now loaded! The safety button (See Figure 1a) should be
fully protruding from the right side of the trigger guard indicating the “ON”
(SAFE) position until you ar

e on target and have actually decided to fir
Keep the muzzle pointed in a safe direction at all times and your finger
and any other objects away from the trigger area.

9

e.