My take: The Rams continue to fill needs by finding some depth at linebacker. They parted ways with James Laurinaitis and Daren Bates during the offseason, leaving them thin behind starters Alec Ogletree, Mark Barron and Akeem Ayers. Forrest should offer some insurance behind new middle linebacker Ogletree. He's 6-foot-3, 249 pounds and finished 2015 with 93 tackles, six for loss, three and a half sacks and two interceptions.
Where he fits: Other than Ogletree, Barron and Ayers, the Rams only have Cameron Lynch and Bryce Hager returning from the active roster last year. So Forrest would seem to be in a good position to potentially win a roster spot. The Rams will undoubtedly bring in more bodies through rookie free agency, so it's no sure thing, but if he can pick up the defense and show some special teams ability he should have a shot to stick.