Smith Sights...sells fully adjustable front sights for the Mosin Nagant carbine or rifle. I own three M91-30's...including a 1943 Izzy sniper, but not with the original scope.
The two main danger's with the M91-30 and M-44, is an over-polished trigger group and racking the bolt forward when the live round does not enter the chamber --- but has the front of the round stuck against the top of the magwell. With any forward force of the bolt in this condition...has the possibility of a premature discharge; with the bullet exiting the bottom of the forearm.
I've had a malfunction of this sort in one of my Mosin's but without the premature discharge --- though one of the former RSO's at our range had such a premature discharge with his Mosin --- with the bullet exiting thru his support hand.
That rifle hanging on the wall of the working class flat or labourer's cottage is the symbol of democracy. It is our job to see that it stays there."
--- George Orwell