MOBIL] 12 gauge Featherlite Competition Choke Tube used for。Muller Chokes Adds Two New Retay Chokes And 20-Gauge Beretta。12 gauge Remington Pro Bore WATERFOWL Choke Tube - MC LLC。Muller Chokes: How Jimmy Muller Started The First Space-Age。ミューラーチョークx2、チョークレンチx1Ü1 = Skeet/Improved CylinderÜ2 = Light Modified/Modified