That's an AKA trigger plate. I'd give you $15+shipping just for it. I'd say the empty frame is worth a solid $40 (more if it was black). The KAPP frame have a trigger stop in the front of the frame. It's very rare to find any trigger stop on a 98+ frame. It makes for a very short trigger pull on a mech and nice autotrigger on a pump. However, it won't work properly with the AKA trigger plate because it has a slotted timing rod.