The device fits around the front sight of the
barrel and has a "L" shaped screw which threads into the
adaptor to hold it together. Then by turning the knurled knob on
the end you tighten the unit up against the barrel crown. This
then forms the gas seal to function the TSMG with blanks.
The unit can be added and removed in a matter of seconds
without modification to the gun. For test functioning or
reenactors this would be of great interest.
