Didn't TC make a flip up tang sight for it ?
At one time, years ago, T/C did make a short range, and a mid-range, vernier sight for the Hawken.
If you find one today you will likely pay an arm and a leg for it, but many feel they are worth it for the versitility
I have had a couple over the years. (Tim may remember some of the following pictures.)
My prefereence of the two is the short range vernier, which is also cheaper of the two vernier sights.
Killed a lot of Rocks, a few sticks, and numerous Stumps with it. Regular sights was set up for 75yds, the raised vernier was then set at about 175yds.which was really stretching it.
Like many lesser quality vernier sights, it is raised & lowered, then held in the upright position by a very small detent ball, pressed into place by an equally small coil spring, which present a less than 100% stable staff....seems that tightening the base screws would always drift the windage...however, in all fairness, much of this could have been 'operator error'.
In the down position, a heavy charge with heavy recoil can raise the vernier up....not all the way, not far enough to lock in the upright, but somewhere around half-way. Which is not all that bad, just something of a pain keeping your eye on it all the time to make sure it doesn't get bumped, or damaged.
I would say it is an "okay" sight, just not in the category of MVA, Soule, or Pedersoli...still yet, it's great for Rocks and such.