AR-15 Buffer Tube Castle Nut

Modeled from the dimensions of my existing aluminum castle nut. Threaded for 1 3/16-16 buffer tube (standard Mil Spec). The installed picture also shows the end plate that I printed and uploaded from my current AR-15 dedicated 22LR build.

End Plate with Quick Disconnect Sling mount:
https://www.thingiverse.com/thing:2551145