We're about ready to release the Russian artillery crew for Central Asia--see the pic above.
As for the guns, you have choices. I will release a Krupp 77cm field gun soon. Although there is one of these on display in Turkmenistan (I think; it may be elsewhere), not sure of the dates it might have been used. If you want to use a bronze cannon, there are lots of manufacturers out there who make nice ACW field pieces. For a light gun, you might consider our Italian mountain gun.