Just wanted to put out the word that I'll soon have full length tube replacements for the Benelli M4 Custom made in Canada, plugged to the legal limit of 5.5 or so 3" shells, and 6 x 2.75" shells. Unfortunately Titanium isn't an option right now due to the extreme costs of titanium in Canada. They will be made from 4130 steel and parkerized to a similar colour to the barrel. I am hoping to have them available in early August.
If you do want to be notified when its available, you can visit www.rxarms.com for more info. Local pickup will be available in Southern Okanagan