dek I stripped mine down today and basically found the same things you did, the usual tool marks and some rough edges that came down quickly and easily with a sharpening stone..over all I'm pleased with this rifle inside and out. Now the big test....I need to shoot it!
When I stripped my new Remlin 336 the innards were pretty smooth with very few metal burrs which I nipped in the bud with jewelers files and a fine grained knife sharpening stone.
A 6 year old could strip apart and reassemble a 336 or 1895 and a good post purchase stripping/cleaning/deburring never hurts.
But if you are not the adventurous type just remove the butt stock and spray the receiver and action down with non-chlorinate brake parts cleaner while working the finger lever vigorously and let the run-off drip into a pail until the drippings run clear.
Then relubricate with your favorite aerosol oil (I used Remoil which is as good as any) and distribute the oil to all moving parts in by cycling the action.
This cleans most of the factory gunk out of the action and relubricates the action with clean oil.
After that I broke the action in by cycling it at least 500 times and it is now as smooth as melted butter.
Cleaning and breaking in a new levergun isn't rocket science.
It takes about an hour inclusive of the 500 cycles.
