Ruger Mk I at top; Ruger Mk II; Ruger Mk IV Hunter.
<p>This photo allows you to see the evolution of the design.  I don't shoot the Mk I much because the bolt doesn't lock back on an empty magazine, so you have to use a chamber flag for range safety.  The Mk II has an amazing trigger because of some work I did to it long ago (I forget exactly what), so that's another reason it's preferred.
</p>
The heft of the Mk IV Hunter due to its bull barrel makes it fun to shoot, but some people get a little fatigued from holding it up.
Mitch Barrie
CC BY-SA 2.0
<a rel="nofollow" class="external free" href="https://www.flickr.com/photos/simonov/35195281654/">https://www.flickr.com/photos/simonov/35195281654/</a>