Beretta Choke Tube Mobilchoke Extended HuntingThe Choke tube family has been studied in order to satisfy all the hunters needs. For this reason Beretta has been develop four new constriction: Extra Full, Light Full, Light Modified and Skeet USA.Fits: Beretta Silver Pigeon I (field models), A300 Outlander, 687 (field models), Some 391 Models.Details:Extended Hunting Tubes fit on all MOBILCHOKE barrels.Made of High Quality Steel, due the heat treatment they have great stress resistance.They are blued and have an antireflection coating.Available in 20 gauges: Can I use Steel Shot with my Beretta Choke Tubes?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.