All four were longer shots for a roster spot, with Moe the most highly touted.
Grissom and Moe spent last year on injured reserve, while Reed and McGuffie ended the year on the team's practice squad.
In addition, offensive linemen Brice Schwab and Elvis Fisher, and running back Quentin Hines were waived, per the NFL's transactions wire. Fisher and Hines were waived with a failed physical designation.
These types of "housecleaning" moves are commonplace at this time on the NFL calendar, as the 2014 league year officially begins Tuesday at 4 p.m. ET.