Staples are stuck inside the stapler and will not come out

Typically you do not open these up.
Makes it difficult to remove stuck or wrong staples.
I have had good luck removing the staple ram rod and rapping firmly on the **** of the stapler against a wooden table. The idea is jolting the stuck staples into reverse out the way they went in. Tedious process but usually works. Removing the jammed staples in the nose at the striker plate requires using needle nose pliers and a sharp awl or small screw driver used on very small screws.
My T50 Arrow stapler is over 20 years old.
Still works great. Sometimes I slide in the wrong size staples by mistake. The process above usually works.
Good luck!

Remove the front plate that is held in place by 2 small rods, then pull the staple channel out to remove staples.