The Las Vegas Raiders signed undrafted free agents RBs Trey Ragas (Louisiana-Lafayette) and Garrett Groshek (Wisconsin), WR Dillon Stoner (Oklahoma State), TE Matt Bushman (BYU), OT Devery Hamilton (Duke), DT Darius Stills (West Virginia), LB Max Richardson (Boston College) and DB TJ Morrison (Stony Brook) on Sunday, May 2.