Front Sight Adapter Rings for Shortened Mosin Nagant 9130 Barrels
Features: CNC Machined from Solid Steel with Black Oxide finish. Made in USA! 100% Lifetime Warranty. Front Sight Adapter Ring allows for the use Original Post & Globe front sight (that has been removed during barrel shortening) of a Mosin Nagant 91/30 without permanent modification to firearm. It is designed to fit over tapered barrel of the Model 91/30 and be locked in place with two opposing set screws. The Original dovetailed Post & Globe front sight can then be pressed in to adapter. The adapter has been design to maintain the original sight line.
https://www.fastenright.com/stainless-steel-hexagon-bolts-din-931. Rotation of a hexagon bolt (Din 931).