[Benelli M4 Collapsible Stock on gunbroker.com]

I purchased a c stock from heckler&kochp2000 on GunBroker, and I have to say the experience was very positive. Communication was very good. Thanks again for everything!

[Benelli M4 -- Magazine Tube Polishing]

Both Titanium and aluminum are highly suseptable to galling, the combination of an aluminum follower in a Ti tube, I suspect will eventually result in scrubbing of the naturally forming protective oxide layer and galling will result.

 

What about a Ti tube with a stainless steel follower?