I just acquired this and wanted to share it. It is a Snider Enfield MK III Cavalry Carbine .577. It has all the war department markings and is British made, but was sold out of service to the Portuguese. My understanding is that the ring behind the trigger guard is distinctly Portuguese as well as some of the serialized markings. It was made in 1870. The bore is quite good with the exception of a 1/2" rough spot about 5" in from the barrel crown. I have been slowly working on it and it is gradually getting better. I have certainly shot a lot worse. I pulled everything apart and cleaned all the old grease and crud out of the lock and the breech mechanism. I used some of Kramer's antique cleaner to get the grunge off of the stock, but keep the finish in place followed by some wax once clean. There is some really nice figure in the wood. I have 3 other Sniders and shoot them quite a bit. The round shown is made from 24 guage shotgun brass. The bullet is from an Accurate mold and is pure lead. It falls from the mold at .594 and weighs about 500 grains. It is over 70 grs of Goex Cartridge with some shredded cotton ball for filler, a .025 card wad, an SPG grease cookie another wad and the boolit hand lubed with SPG. My Enfields seem to really like this boolit. My Nepalese Snider does better with a .600 boolit (also from an Accurate mold). Now it is off to the range to see how she does.