Originally Posted by RussC

I paid a gunsmith to install my XS Big Dot on my Shield and fortunately I have not needed adjusting so I can't speak from experience if the sights are too tight to adjust.

I can speak from experience that in the 6 months I have been pocket packing with the sights every range trip has been consistent with regard to the aim.

The design of the rear sight does open up your field of view with the shallow "v" shape over a square shape notch and post however alignment of front and rear sight is not as precise with a shallow "v" shape but for 7 yard shots I can group my shots in the black (7,8,9,10) of a 50 ft rated target.

I figure for increased speed to acquire target XS design provides over notch and post I gave up one inch in my 7 round groups at 7 yards. (1 1/2" notch & post vs 2 1/2" for XS)

Russ