Sig m400 tread owners - Luth-AR Palm Handguard

I purchased the 15" mlok version from a local gun shop. I was not looking forward to attempting to remove the gas block since the pin is pressed in. Also because the sig barrel nut wrench cannot be purchased. On a whim i mounted on the sig barrel nut and....it works! Nice and tight and the cap screws match up to a groove in the sig nut. The sig nut is not knurled, however, so i will see if it moves when it's fired. But so far this is a great alternative for Tread owners, especially considering the front sight situation. And it is noticeably lighter than the stock sig guard.