USA463 - Professional eye piece.  It has 8 viewing holes of different diameters (.012 /.020 /.031 /.039 /.051 /.063 /.078 /.086" - 0,3 / 0,5 / 0,8 / 1 / 1,3 / 1,6 / 2 / 2,2 mm) placed on a rotating disk, which can be selected without disassembling or loosing the eye piece, following the available light.
The eye piece has a rubber ring to avoid any inconveniences due to recoil.

It is interchangeable on the Creedmoor sights:

- USA 404

- USA 405

- USA 406

- USA 407

- USA 407-A

- USA 430

- USA 431

- USA 433

- USA 436

- USA 445

- USA 446

- USA 454

- USA 459

- USA 461

- USA 464

- USA 465

- USA 557

- USA 557-A.