what fixed and folding rail mounted front sights are currently available? with the trend towards mid-length, free-floating railed forends i believe demand will grow for these.

i would like to see some rail mounted fixed sights with different heights for the many rail systems available. i saw a real slick fixed sight on the cover of 'guns and weapons for l.e.' a few months ago. iirc, it was mounted on a 'sir' of some sort.

edited to add:
which will are intended to fit on the gasblock/knight's ras/arms products?

opinions and pics appreciated.  

If you check EE, you will see G&R Tactical sells a Knight's Armament Folding front sight that mounnts on a rail.

Armalite makes a standard sight tower that mounts on a rail.

[url]http://troyind.com/news.htm[/url]