These extended choke tubes (20 mm) are designed for 12 gauge shotguns with the Mobilchoke system.
Extra Full, Full /*, Light Full and Improved Modified /** constrictions cannot be used with Steel shots.
***Please note that the constriction cut off for factory made choke tubes with steel shot is a Modified constriction, factory made choke tubes with a constriction tighter than Modified such as Improved Modified and Full are not suitable for use with steel shot.
Additionally, rifled or sabot slugs should not be used in a factory made choke tube with a constriction tighter than Improved Cylinder.***
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We suggest that – when using Steel Shot – you only use choke tubes marked with the SP (Steel Proof) identification on the side and that you use the most open choke system possible – i.e. Cylinder / Improved Cylinder / or Modified. We DO NOT recommend use of Steel Shot in the X-Tra Full Turkey / Full / or Improved Modified choke tube. As with any shotgun, always be sure to check your choke tubes during use to verify that they are tight in the barrel. Loose choke tubes can cause barrel damage.
