About This File
Weapon ball joint clamps.
You need two of each part, 8 off M6x100mm hex head screws, 8 off M6 mashers, 8 off M6 wing nuts 8 off 3x15 countersunk woodscrews.
The clamps sandwich the 100mm diameter spheres. Put the M6 bolts into the captive sockets and then screw this onto the inside of the gun box. Fit the weapons, then the 2nd clamp ring and then the washers and wing nuts. Adjust how free/tight you want the weapon to be with the wing nuts.
CAD file is in RS Design Spark Mechanical format (free 3D CAD). If you change the extension to .sdoc then it will also open in Ansys Spaceclaim (not free) and maybe other CAD packages.