[quote=@Voltus_Ventus]
[@Willy Vereb] So how will the riders attack? With small arms?
[/quote]With small arms, of course. They might try to carry one or two bombs to manually drop but that'd be already risky.
Aside from strict weight limitations there really aren't that much space to hang things on the griffin's body, either.
You have to leave a sizeable portion of the griffin bare to allow free movement for its wings.