I received my Ti extension tube last week. Installation was a breeze. A little heat around the receiver and mag tube for about 60 second, a twist using a glove and presto! Unscrewed without a hitch. Cleaned up the receiver threads with acetone, applyed blue loctite to new mag tube threads and screwed it in. Hole job was less than 20-30 minutes.
Great product and service.
I've been using the same, Winchester Military 00 buck. I have also used Wolf 2 3/4" 00 buck, but it's 1/8" longer than other standard load lengths, making it impossible to get a full magazine loaded in the M4.