specifically to lead shot. You will need to use the charts on the next
page to cross-reference from lead to steel, and determine the
appropriate tube for your ammunition and hunting/shooting situation.
Several choke tubes are supplied with your shotgun. The choke tubes
listed are also available as accessories. Remember, Standard Invector
and Invector-Plus tubes are not interchangeable. Invector-Plus tubes
are for Browning shotguns with back-bored barrels only. Before
removing or installing tubes, or reading the rim notch code, make sure
your shotgun is completely unloaded.
C H O K E T U B E R E M O VA L
1 Place the “safety” in the on safe position. Always make sure the
shotgun is completely unloaded. Always keep the muzzle pointed
in a safe direction.
2 Use the choke tube wrench to loosen the tube, turning it
counterclockwise. Finger-twist the tube the rest of the way
out of the barrel.
C H O K E T U B E I N S TA L L AT I O N
1 Place the “safety” in the on safe position. Always make sure the
shotgun is completely unloaded. Always keep the muzzle pointed in
a safe direction.
2 Before installing a tube, check the internal choke tube threads in the
muzzle, as well as the threads on the choke tube to be sure they are
clean. Lightly oil the threads with a high-quality, lightweight
gun oil.
3 Using your fingers, screw the appropriate tube into the muzzle of
the barrel, tapered end first, notched end outward. When it is
finger-tight, use the choke tube wrench to firmly seat the tube.
NOTICE! the choke tube should be periodicAlly checked to
Assure thAt it is tight And firmly seAted. before checking,
follow All choke tube removAl And instAllAtion sAfety
guidelines previously outlined.
figure 14
N O N O T C H E S
F I V E N O T C H E S
F O U R N O T C H E S
T H R E E N O T C H E S
T W O N O T C H E S
O N E N O T C H
R I M
N O T C H E S
P A T T E R N W I T H
L E A D S H O T
P A T T E R N W I T H
S T E E L S H O T
e x t e n d e d * * x - f u l l t u r k e y
* *
i f u l l *
i i i m p. m o d i f i e d
f u l l
1
i i i m o d i f i e d
f u l l
1
i i i i i m p. c y l i n d e r m o d i f i e d
i i i i i s k e e t i m p. c y l i n d e r
n o n o t c h e s c y l i n d e r c y l i n d e r
*
Not for use with steel shot. Using an over-tight choke constriction with
steel shot will result in an ineffective “blown” pattern.
**
Extra Full Special, extended with ports. Do not use with steel shot.
1
When more than one choke designation is listed for a given steel shot
pattern, use the more open choke listed for high velocity, larger shot size
steel loads.
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