I'm usually pretty good at this, but I have no clue what these rifles are. Any help would be appreciated. Picture was taken in Palestine in the 1890s

    Looks like the negative was reversed, as t he bolt handles are on the wrong side.   Kinda looks like GRAS carbines, to me.

CHRIS 
RGChristtensen

Aha! Yes. They look like Gras carbines indeed. Thanks! I don't know much about the early single-shot bolt guns besides the Mauser.

It's later than tintype (and I have seen the original and know it's not). I wondered about the flip, but the gentleman on the left's hand on his knife had me second guessing that.

This is a mixed group of Russian Jewish refugees and Palestinians, working together to resist Ottoman imperial control. The notion of making a zionist ethnostate was not yet widely held by Jews in the region.

Reading a bit, it makes sense that they would have Gras rifles. The Gras was adopted by the Greeks and was widely used by Greek rebels seeking to throw off Ottoman control. It would not be surprising if they had supplied other anti-imperial forces elsewhere in the empire.

Reversing The Photo French Gras Cabines, Forgers, or short Rifles
All single shots with the wide Trigger Guard

Fascinating photo:   really wish I knew more about it.   I have seen somewhat similar photos but none near as sharp or detailed  

IF I were to WA-guess based on my studies of the area and era.
I'd be inclined to think they were a group of hired guards of mixed ethnicity common to the area who were retained under the services of a dragoman to guard / guide a party of merchants or early tourist-pilgrim-adventurers common to the era; a party that the photographer was part of. 
Most of the European nations had facilities and services in the area to care for such "pilgrims" from their own countries. Armed guards for hire were part of the pilgrim package which might explain the uniformity of the rifles------they might be working for the French group and might have a French mixed breed "officer" in command.
Based on what I see, the second from the left is probably a stray cossack-for-hire (not uncommon there--the Russian Orthodox has a strong position in the religious mangle that managed the"holy sites") judging by his costume, typical long cossack dagger, and vaguely asiatic features.
  The third from the left wearing the belted revolver with the sort of european look and clothing is probably the leader of the group and may be a french mixed breed or even an expatriate. 
The other three are probably from one of the Palestinian clans--but certainly not  of the desert Bedu.   there was not that much active insurrection against the Turk's at that time-that would be another 15-20 in the future,  Bedu bandits, religious rioters, and organized thieves were more of a threat to the pilgrim parties

At the time the photo was taken the area was called Palestine as part of the Ottoman Turkish Empire until the end of WW1. There was a small surviving old-Jewish population residing in enclaves and a few small settlements of very early Zionist settler/pioneers from the Jewish diaspora.
 
After WW1 it became a British "protective" Mandate still under the name Palestine.  Many more Jewish Zionists began emigrating causing open and violent conflicts with the long-time resident Arabic Palestinian population and the British who tried to mediate the conflicts. After WW2 there was a flood of refugees and survivor DPs from the Jewish populations of Nazified Europe.   When the British pulled out, the Jewish population declared independence and statehood. They adopted the name Israel, and bitter, and near unending war broke out between them and the surrounding Arabs.