Rifle windscreens come with a nylon nut, screw and washer to fasten the shield to the lower unit. There seems to be two schools of thought on this:
- So you will not over tighten the screw, cracking the shield.
- It's a safety matter. These bolts will sheer in the event of a get-off. These shields may fracture and become jagged if retained with metal fasteners.
This kit comes with 8 sets of washers, nuts and screws. Black nylon. That gives you two spares.