Choke Tube Guide

IMC (Integral Multi Choke)


Models that use this choke pattern:
  • SA-08 (12 & 20 gauges only)
  • PA-08 (all)
  • SA-459 Turkey Xtra Green
  • Orion
  • Element (12 & 20 gauges only)



The IMC choke tube thread pattern is compatible with the following choke tube patterns: Browning Invector (not Plus), Mossberg Accu-Choke and Win-Choke. Suggested aftermarket choke tube manufacturers: Trulock, Carlson’s, Briley Manufacturing.


Beretta/Benelli Mobil Choke


Models that use this choke pattern:
  • PA-459 (all)
  • SA-459 (except Turkey Xtra Green)
  • SA-459 Turkey Mothwing Spring Mimicry (Discontinued Model)
  • SA-08 (28 Gauge only)
  • Element (28 gauge only)

Suggested aftermarket choke tube manufacturers: Trulock, Carlson’s, Briley Manufacturing.


The Use of Slugs

Smooth bore barrels with choke tubes should have "Cylinder Choke" tubes installed when using Foster or Bernneke style rifled slugs. A "Cylinder Choke" will provide the best accuracy. Any choke with constriction of .020" or more can result in damage to the barrel. Our "Improved Choke" tubes have a constriction of .013" and therefore may be used with rifled slugs; however, accuracy may be compromised. Weatherby recommends slugs only be fired using a non-ported cylinder choke.

At no time should you shoot without a choke tube installed as this may cause damage to the choke tube threads in the barrel.


Choke Tube Identification

Choke tubes can be identified by the number and placement of small notches found on their muzzle (non- threaded) ends.

O Extra Full
I Full
II Improved Modified
III Modified
IIII Improved Cylinder
IIIII Skeet
IIIIII Cylinder
I-I SC I
II-II SC II