Quick Release Barrel Mount

Material: Aluminum
Ring Diameter: 30mm with a 25.4mm insert 
Rail Size: 20mm
 
By flicking the lever out the lower piece detaches. Great for searching with the torch and then snap it back on for the shot.
 
Tried the barrel mount on a .22 and .308 with a diameter of 14.1mm - 17.5mm. Looks like it should be okay up to 18mm diameter barrel, anything smaller than 14mm should be fine, if not it's simple to wrap something around it.