Well, I guess if you used the butt end to bash someone with while holding the barrell, you wouldn't necessarily get tissue on the silencer if it were attached.
I don't believe that the attacker hit Neville Bamber with any part of the gun as was suggested, since there was no scientific or expert opinion where marks made on the body were caused as a result of being struck by a specific part of the rifle! I believe its much more likely that any such injuries were caused as a result of Neville falling against some hard / sharp/ blunt object or oither. In Point of fact, stop and think for a moment the liklihood of Neville bambers head and face falling perfectly into the metal coal bucket by the corner of the kitchen aga? Surely, his head and face striking against the hard metal rim of that bucket would have caused serios injuries of the tyoe and nature which has been fobbed off as being caused by being struck with the rifle in club fashion?
Neveille Bamber was a big bloke, and heavy - there would have been one hell of an amount of force impacting against any part of that bucket when his head fell against it or into it! And, where else did Neville fall and bang his face andd his head?