nasa
.270 WIN
The rifled sights on the rifled barrel are Williams sights. They have a fiber replacement called Fire Sights. Perfect replacement. Think I got mine for $36 from MidwayUsa. Were very easy to install. the forward sight needed a little bit of gentle persuasion with the aid of a small punch and hammer to loosen. The new ones went in with no problem. See my pictures on page 2 of this post.