This is a great little set of three bolts/screws to compliment any Spade Grip.  The bolts include the Gun Button retaining bolt, Parking Brake bolt and Brake Lever bolt.
 
These are all custom made with the correct BA threads and can be seen in the picture above fitted to one of the Spade Grips that I also make.
 
The Parking Brake and attachement plate are also extremely popular, you can find them under Spade Grips and Small Parts sections.