On the subject of Tactical .22's...technically, there is no such thing...as tactically the .22lr is not what anyone in their right mind would pick to defend with,
given almost any other caliber as choice.
But given that someone would want to choose that platform...some MFR's have made it possible to at least put up a worthwhile fight
Calico M-100 Tactical...which has 100-rounds per mag capability, a quad-rail forearm, and folding stock...
if you MUST use .22lr as a defense weapon, at least the mag capability means one could hold off several people and do serious damage.
Also comes without the quad-rail (original 1990's form, model not included)
And the Calico M-110 pistol also has 100-rd mags...and for fun, a laser was put on...
Anything less than a 100-rd mag of .22lr ain't quite enough...IMHO
If you are going to use an inferior man-stopping caliber, best to use a LOT of it!!
At least if you burn thru a 100-rd mag...anyone that ain't hit will be thinking seriously about where the closest exit is...LOL
Best thing about the Calico's...they also come in 9mm!!
They've been talking about the .40 version for several years now...the update on the website sez late 2012...