Gunsmithing Mausingfield rail torque

Is it the newer aluminum ones or the older steel ones? There would probably be a difference there. Loctite would definitely be a good idea as well.
FWIW, the rail on my Mausingfield is steel, and I received it back in March (of course, it was an in-stock action at the builder... so there's no telling when it was manufactured).
 
I guess I was assuming that the newer ones were aluminum since the ones being sold on the website as replacement rails are aluminum. My first one is like s/n 42 or something and it's definitely a heavy steel rail.