This is a Fortis Manufacturing, Inc. End Plate known as the Lightweight Enhanced, model LE-BLK-K1-GOLD.
The K1 system features a tapered castle nut that seals itself onto the end plate. This ultra precision snug fit allows the castle nut to seat and seal itself into place without the need of staking the end plate. No ratcheting" no set screws" no backing out and no failures.
Features:
Lightweight design
Quick Detach Socket
No set screws or ratcheting system
7075 T6 Aircraft Grade Aluminum