This is the 6-pounder field gun of 1841 as it was used in the american civil war.
I tried to model as accurate as possible but some parts had to be slightly changed to make them printable.
The drawing below was used as a template:
More historical information:
Additional you need:
3 mm x 190mm shaft from brass for the axle. You can flatten the ends with a hammer. Then drill a 1,5 mm hole.
Some nails and needles to fasten the fittings.
3 threaded rods M3 x 40mm to fasten the cheeks
1 threaded rod M3 x 18mm for the elevator
1 threaded rod M3 x 22mm to fasten the stock
4 theaded rods M2 x 10mm with nuts and washers for underneath cheeks
In case you take metal hexagonal nuts better blacken them by heating and, if possible, file the M3 rectangular.