I would like to add my opinion that the Armi-Sport 1842 is perhaps the most authentic, best reproduced, mass reproduction being put out of Italy. The lock parts are sound, well designed, faithfully reproduced, as are there other hardware.
I have been shooting one since they came out basically, and am impressed with their accuracy as well. In fact, half of the guys on our Championship N-SSA Smoothbore team (including myself) shoot these arms. I would recommend highly recommend them.
In additon, I have read where many hardcore and progressive reenactors think these particular guns are about the most authentic repros available, and are among the easiest to "de-farb".
1st South Carolin, N-SSA