Owner’s Manual 2013

26 27
STANDARD INVECTOR TUBES ARE FOR USE ONLY IN FNH USA
SHOTGUNS WITH NON BACK-BORED BARRELS, AND ARE NOT
INTERCHANGEABLE WITH INVECTOR-PLUS OR INVECTOR-DS
CHOKE TUBES. DO NOT USE STANDARD INVECTOR TUBES
IN BARRELS THREADED FOR INVECTOR-PLUS OR
INVECTOR-DS TUBES.
DO NOT USE WINCHOKE, STANDARD INVECTOR, INVECTOR-DS
OR INVECTOR-PLUS CHOKE TUBES IN ANY SHOTGUN
BARRELS NOT SUPPLIED BY FNH USA. DO NOT USE ANY
OTHER CHOKING DEVICE IN ANY SHOTGUN BARRELS
SUPPLIED BY FNH USA.
FAILURE TO FOLLOW THESE WARNINGS MAY CAUSE INJURY
OR DEATH AND CAUSE DAMAGE TO YOUR SHOTGUN.
Most P-12 shotgun barrels are threaded to accept the Standard Invector
™
choke tube system. Standard Invector, Invector-Plus
™
and Invector-DS
™
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, Invector-DS 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
in Arnold, Missouri. See page 46 for contact information.
FIGURE 8
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.