Patent ID: 7588122

Claim:
An attachment orientation apparatus for a firearm noise suppressor, comprising: a substantially cylindrical housing mountable to a noise suppressor having an open end and configured to receive a piston; a piston having an end configured for threaded attachment to a firearm barrel and configured to be received by said cylindrical housing and having at least one longitudinally-extending external indexing surface; an tapered annular collar configured to interface with said housing open end and having at least one internal indexing surface configured to engage the piston's indexing surface; and a retention cap configured to adjustably secure the collar tightly against the open end of the housing and rotationally restrain the collar relative to the housing, the cap having an opening sized to allow at least a portion of said piston to pass therethrough, whereby said orientation apparatus provides infinite adjustment for the rotational orientation of an affixed noise suppressor by selective securement of the collar against the housing by the retention cap.