Hi Brad, and welcome.
Have you removed the right hand grip? The trigger linkage is underneath, and sometimes balks when the grip screw nearest the trigger is loose. Please note before proceeding that There are many threads in this forum discussing the proper removal, locktiting and reinstallation of these screws and maintenance of the trigger linkage. Itis time well spent to read as many of these as you can to familiarize yourself with this issue.
Brad