Friendship only gets you so far in the NFL -- so says one of RG3's former Redskins teammates who says he won't hesitate to beat up on the QB this season ... even though they're good friends.
We got Washington Redskins defensive end Ricky Jean-Francois out in D.C. Monday -- and asked if it's gonna be weird to try to kill Robert Griffin when they play the Browns this season since the two are pretty tight off the field.
The short answer -- no.
The NFL hasn't announced when the two teams will face off, but it's definitely happening in 2016.
Should be a fun one ...