This is a common rmr footprint adapter plate for an Umarex Glock 17 Gen 4. I designed a better one that uses M4 bolts and fits more snug. With the proper size bolts it shouldn't scratch your slide like this one does.
Here is the updated version https://odysee.com/@ZanderLabs:0/RMR-Plate-V3
LBRY Tags: airsoft; glock; umarex
Glock Slide Display V2 P80Ralph Edition by MacNay Arms