Mobhack,
Dates for the various RWS systems is hard to come by. I did find that one of the firt IDF vehicles to mount one was the Merkava MkIIID or Dor-Dolet. This was the last production version of the Merkava MkIII and incorperated some of the features that would later be found on the MkIV. But I could find no dates for this vehicle.
I did find a March 2005 date for one of the Elbit R-OWS systems. this date fits with contracts for system sales to
Austria------May 2005
Portugal-----Feb 2006
Romania and Slovenia----July 2007
Belgium------July? 2007 in concert with their Pirana III program but systems were also fitted to other vehicles.
The other date was for a completed contract by Rafael for the Mini-Samson R-OWS. The Canadians called it the Protected Weapons Station (PWS). The first part of the contract was completed in the second quarter of 2001 (May-June). At first they were armed with a M240 7.62 MG but the system can mount anything from a 7.62mm to a 40mm Mk19 AGL. The original systems were mounted on some M113s and some LAVIIIs.
This may need its own thread! My brain hurts
About the Puma. It has an extra slot so fitting the 60mm Soltam is no problem. Its primary purpose is to take out infantry MG and ATGM teams at long range. 30 rounds are carried and most are HE.
Puma and R-OWS. I have seen no pictures of a Puma without one. I have seen a Puma with a R-OWS mounting a 50cal but like I said before dates are hard to come by. On the newer versions with the "Aquarium" structure on top of the hull a 7.62mm is mounted to the R-OWS.