I bought the same device from either Creedmoor Sports or Sinclair about 15 years ago. I don't remember how much it was but has been real handy. I wonder if he supplied Creedmoor/Sinclair way back then?
Just curious as I have seen this thing, but I thought it was a good idea to clean the M1 upside down to keep stuff from getting in the gas port. Not true? That's the way I have been doing it for a few years now.