hi standard r-103 cylinder problems

[coronel]

I have a hi standard r-103 which the cylinder is hanging up or rather fails to proceed further in da what could be the problem?

[Dfariswheel]

Simply not possible to diagnose without seeing the gun. due to too many possibilities.

The "usual" when a revolver fails to index is a problem with the "hand" or it's spring.

Here's an exploded view of a typical High Standard Sentinel on which the 103 is based.
The hand is part number 19.

http://www.stevespages.com/ipb-histandard-sentinel.html

Before attempting a repair, it's necessary to know EXACTLY whats wrong. All too often people start altering things hopping to hit on a fix, and wind up ruining the gun.
Unless you know for certain, see a gunsmith.