Law enforcement - ZEV Technologies Universal Pro Magwell

I wanted to item for my Glock 17fs gen 4. I bought the Magpul version and that did not work on my 19 or 17. I sent it back to opticsplanet and they returned it without a problem. I then purchased the Zev technology brand and it did not work on the Glock 17fs. I don't know if the grip is different from other gen 4 Glock. I tried the detention on my Glock 19 and it worked and for perfectly. I am happy with the for and function eventhou it's not on the glock model I bought it for.