I think you can only get the lightwieght in tupperware stock. For me, there is only one BAR, and thats the safari steel reciever version. I won't own a short or longtrac myself.
it's actually a little better then tupperware but I agree on the steel receiver part. Lets not forget that the triggerguard on the short/long is plastic as opposed to metal as well. The gun was a halfwit rusheddesign so they could have something modern looking like the Benelli r1.