Single shot adapter for RPR

[lipofsky]

looking for a single shot adapter, tried the rotary 1 round it works but was wondering if there is a better alternative. Thank you in advance

 

[Mobuck]

Just a suggestion that would require sacrificing a magazine. Take the guts out of the mag and use some sort of 'filler' (body putty) to take up the empty space with a groove at the feed lips for a sing cartridge. Much nicer way would be for some laser printer guru to print a hollow mag body with that little cartridge tray on top.