I thought that looked like a 742.
I have one as well. Mine is a 30-06 with a 18" carbine barrel. It is MOST LOUD.
It is a great gun for hunting in all this thick southern stuff.
Over 30 years I have killed about 40 deer with mine.
My dad killed a few with it years back.
Don't see well enough (anymore) to shoot rifles without a scope...
An old style Weaver 4K sits on top of mine.
David