This nuts allow you to use M X 6 screw or fit to bottom of Vulcan Air Arms and many other air guns to allow you to fit Bipod and other accessories to blow your stock.
This nuts are made of stainless steel.
You need to install them like it is shown on 3rd photo.
The 3rd photo is just to show you how to install them, nothing from the 3rd photo is included.
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