there is also the possibility that he was using the Stabler or even the Spencer cut off to allow use as a single shot, holding the magazine in reserve for a real extremity. IF he was seeking to be really authentic. Of course, those blanks made up for the Spencers are not too great on function. I had some blanks turned out of aircraft aluminum to replicate the dimensions of a loaded cartridge, bored through and recessed in the head to accept a 209 primer (shotgun)-- the powder is loaded into the passage from the nose, and held in place with florist's foam. Makes a good bang and cloud of smoke. Feeds fine. Just have to be careful not to lose them in the grass, but since they are aluminum, not too difficult to spot.