M4 gas port cleaning. in Benelli Posted August 22, 2009 OK! I understand the words that are coming out of your mouth... It does not appear the ports are cleaned by anyone so we are forging ahead to new territory. You may be able to clean the ports from inside the barrel with a right angle dentists brush. They are referred to as interdental or interproximal brushes. They come in a variety of diameters and some are conical in shape. I don't have a clue what diameter the port is but you may find something big enough to work (the first link shows standard passage hole diameters for each standard size brush) . I don't think I would recommend using a dental pick as it would scratch the **** out of the bore finishes in the piston sleeve and/or barrel. ISO Standard Sizes: http://www2.tepe.com/fileadmin/uploads/phd/tepe-phd-EN-ver-1.pdf A Company that makes a right angle handle with interchangeable tips: http://www.dentist.net/butler-proxabrush.asp Remember to see your dentist and gun smith for regular 6 month cleanings and checkups:D YES! ABSOLUTELY perfect! Thank you so much. I genuinely appreciate it.