I just got my load of parts from Freedom Fighter. I looked at their site and called their number, and did the order on the phone. Got a Ti tube, knob, follower, forarm and spring. I had to have the gunsmith remove the original tube, so he just did it all for me while it was there. Took it out shooting this weekend and it was rock solid. Despite being a somewhat experienced shotgunner, I'm fairly new to the M4, as I had only shot one a few times before getting mine. Todd at Freedom was great to talk to about outfitting this bad boy, and I had my parts in about two days after I ordered, which was kind of amazing. Oh, I went with the 1/2 titanium knob, and it is far superior to the original component.