OFF !
I think leaving it off gives you the opportunity to look at it an mull over a modification that will add value and utility to the piece ... that also takes the place visually of the loading lever ... somewhat.
Like a detachable shell poker for that day when you get a cracked-burned-bulged case that is stuck in one of the chambers.
Also, if you are using it for carry, leave the lever off, you cannot have any chance AT ALL of having the lever interfere with its operation.
MODS:
- itty-bitty, teeny-tiny NAA laser under the barrel ! Old World meets NEW
- rod or wooden stick, (blued), that cosmetically looks like the loading lever.
- for poking a shell out on reload.
- for running a patch through the bore
- bayonet attachment ... Just Sayin' ...
- grenade launcher attachment, (get this from ClemBert).