The sears seem to be missing or the sear springs broken on both guns. Some H&R parts are available from www.gunpartscorp.com
, but on those old guns when parts start to break or wear, other parts are not far behind. Plus, those guns are old, unreliable and questionable for use with modern ammunition.
I am sure others will offer ideas, but IMHO unless you can diagnose the exact problem, find the parts, and do the work yourself, they would not be worth fixing. Worse, most gunsmiths won't take them in; for the above reasons, trying to repair those guns can be time consuming and very frustrating and the customer will rarely want to pay the actual labor costs for repair.