Owner’s Manual 2011

26 27
FAILURE TO FOLLOW THESE WARNINGS MAY CAUSE INJURY
OR DEATH AND CAUSE DAMAGE TO YOUR SHOTGUN.
Most SLP shotgun barrels are threaded to accept the Standard Invector
™
choke tube system. Standard Invector and Invector-Plus
™
tubes are not
interchangeable. Confirm the choke system of your shotgun by looking on
the left side of the barrel where the specifications are inscribed, where the
choke markings are normally located.
The constriction of each choke tube is indicated twice on the choke tube: on
the side of the tube, and indicated with a “notch” code on the top rim of the
tube. The included universal choke tube wrench is used to remove and install
choke tubes.
Invector-Plus and Standard Invector choke tubes are compatible with factory
ammunition that has been loaded in compliance with SAAMI specifications,
including magnum lead and steel shot loads, sabots and shotgun slug loads.
Replacement and additional tubes and wrenches are available from your
FNH USA dealer, or contact the FNH USA Customer Service Department. See
page 52 for contact information.
15.1. CHOKE TUBE SELECTION
To help you choose the correct choke tube for each shooting situation, all
Invector choke tubes are inscribed on the side with the patterns they produce
with both lead and steel shot. Each Invector choke tube also has notches in
the top rim of the tube (Figure 9, page 27). These notches are a code to allow
you to determine the choke designation while the tube is installed. Rim
notches refer specifically to lead shot.
Use the charts on page 27 to cross-reference from lead shot to steel shot,
and determine the appropriate tubes for your ammunition and shooting
situation. An improved cylinder choke tube is installed in your shotgun and a
modified tube is included in the box. Other choke tubes listed are available as
accessories. Remember, Standard Invector and Invector-Plus tubes are not
interchangeable. Invector-Plus tubes are for FNH USA shotguns with back-
bored barrels only. Before removing or installing tubes, or reading the rim
notch code, make sure your shotgun is completely unloaded.
FIGURE 9
NO NOTCHES
FIVE NOTCHES
FOUR NOTCHES
THREE NOTCHES
TWO NOTCHES
ONE NOTCH
RIM
NOTCHES
PATTERN WITH
LEAD SHOT
PATTERN WITH
STEEL SHOT
EXTENDED** X-FULL TURKEY **
I FULL *
II IMP. MODIFIED
FULL
1
III MODIFIED
FULL
1
IIII IMP. CYLINDER MODIFIED
IIIII SKEET IMP. CYLINDER
NO NOTCHES CYLINDER CYLINDER
* Not for use with steel shot. Using an over-tight choke constriction with steel shot
will result in an ineffective “blown” pattern.
** Extra Full Turkey, extended with ports. Do not use with steel shot.
1
When more than one choke tube is listed for a given steel shot pattern, use the
more open choke listed for high velocity, larger shot size steel loads.