Subcalibre Device?

[Oatmeal Savage]

Found on GunsAmerica, are these beasties very common? This fellow is selling four.

http://www.gunsamerica.com/guns/976647868.htm
http://www.gunsamerica.com/guns/976667812.htm

Thanks
OS

Information

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[Claven2]

No, not common. And pretty cool too!

[Lee Enfield]

Run, Run away from Surf City!

I can't comment on this piece, but they do have quite the reputation:

Someone runs a lot of "factory new" guns through there on an extremely regular basis.

Search on the Jouster.com service pistol forum for more info.