DONT TRY TO DISASSEMBLY it like an Artillery Luger sight, you WILL BREAK IT! TRUST ME I broke a Browning High Power Tangent sight that way. Tom Heller told me the correct way and it works great for Hi Powers and Broomhandles.
These are removed by pushing down on the rear of the sight(the end closer to the muzzle) JUST close to the two side retaining nobs (pin like extrusions that are actually PART of the rear sight) This will compress the spring that is UNDER the sight and when the rear of the sight goes down the rear sight can be pushed toward the grips and removed. The pin like extrusions MUST go down far enough to clear their retaining holes. I use a large wooden dowel to push down on the sight to not mar or scratch it and a medium size screw driver to lever the sight backwards after the spring is compressed. If you are really talented you can do the whole operation with just the screw driver!! Reassembly is the same way, compress the spring and push the sight forward then let it up.
<img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" /> <img border="0" alt="[ouch]" title="" src="graemlins/c.gif" />
<a href="http://members.rennlist.com/lugerman/JOBroomA2.jpg" target="_fullview"><img src="http://members.rennlist.com/lugerman/JOBroomA2.jpg" width="400" alt="Click for fullsize image" /></a>