This is not a homemade custom conversion or anything, its a 'Serbu Super Shorty' 12-gauge. Serbu does the conversion in house using either a Remington 870 or Mossberg 500 as the base (your choice).
Its got a 16.5 inch total length, making it the smallest legal shotgun anyone can buy in the United States.
Designed for point blank range use.
Strictly a home protection defense weapon.
To see more, go to Serbu Website at: