Original New Old Stock Australian Locking Shoulders. Compatible with both inch and metric rifles. You can specify size in the drop down above the add to cart button.
Along with standard shaft diameter, we have first, second and third oversized.
Size # = standard diameter shaft 0.2974"
Size #/1 = first oversize diameter shaft 0.2982"
Size #/2 = second oversize diameter shaft 0.2990"
Size #/3 = third oversize diameter shaft 0.2998"