Manual

or use the identification mark(s) located on the
top rim of each tube (See Figure 20).
INVECTOR TUBE SELECTION
This chart shows lead/steel choke constriction
designations for each lnvector tube within each
gauge. Designation is listed lead first, then steel:
for example, M/F means a certain tube shoots
Modified with lead shot and Full with steel shot.
Tubes listed are also available as accessories.
12 Gauge lead/Steel
XF/** F/*
lM/F† M/F† IC/M S/IC† C/IC†
Tube Code: XF-Extra Full, F-Full, IM-Improved Modified, M-Modified,
K-Improved Cylinder, S-Skeet C-Cylinder
*Do not use with steel shot. Using an over-tigbt choke constriction with
steel shot will result in an ineffective, "blown" pattern.
**Extra Full Special with knurled rim and no rim code. Do not use with
steel shot.
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 shot loads.