Nine Ball Combat Sight Set for Hi Capa 5.1
 

Aside from the fibre optic sight from Freedom Art(front only) and the Kimber-style sight that only works with specific slide, this seem to be the only other kind of replacement sight for Hi-Capa....I wonder if any one have seen or use these before?

http://www.cobraairsoft.com/product_...93d50df9f39247

mm friend has one. from what i know modification is needed to the sight and/or slide to get it to fit. i don't remember how long it took him though.