I have a model 141, just a little later version, in .35 Rem. It has a Williams peep site installed on the receiver and it is pretty darn accurate w/ factory and handloads.
They are still nice guns and fairly easy to find, especially in .35 rem. Wish I had one in .25 Rem. The neat thing about them is that you can load pointed bullets in the spiral shaped magazine tube without the worry of the a pointed bullet firing the round in front of it.