12 GA Shotgun Flashlight Mount

This is a light clip that I made to attach a cheap LED flashlight to the barrel of my 12 gauge shotgun. The flashlight has an OD of 30mm and the shotgun barrel has an OD of 20mm.

The file titled "18MM..." is for a attaching a small, cheap LED flashlight like this one: https://www.amazon.com/Hausbell-Ultra-Bright-Flashlight-Tactical/dp/B00CEOII9K/ref=sr_1_6?s=hardware&ie=UTF8&qid=1515729355&sr=1-6&keywords=cree+flashlight