Used primarily on shotguns and short range rifles/carbines, the Ghost Ring sites offer very quick target acquisition. They lack the preciseness of small rear peep sights - so are used for close range rifles/shotguns.
As mentioned in "Jeff Cooper's Commentaries" Vol 2. No. 10 (thanks to Barry Needham's monthly writing) ... there is even a Ghost Ring sight for pistols!
"Family member and Shooting Master Louis Awerbuck recently showed us a most interesting device, which amounts to a ghost-ring for a pistol. It is not as obtrusive as one might expect, and it is a great deal less so than any form of glass sight. The large diameter aperture sits low over the rear of the slide, and it does not interfere with a holster which permits the use of a "target sight." I think it deserves study, and I will do what I can to promote this."
HK/Benelli offers Ghost Ring sights on the Benelli M1Super90 and M3 model shotguns.
Many gunsmiths sell and install adjustable sights, amoung others:
Gunsite Custom Shop
Robar
Scattergun Technologies
Tanks
Scattergun Technologies has a Trak-Lock(R) Adjustable Ghost Ring Rear Site,
and Ramp type front sight with Tritium insert in Post for Remington 870s &
1100. Sites made from Chrome-moly steel. Simple and rugged. I have seen
the Trak-Lock(R) on a Remington 870 - looked good. I have not installed it
myself.
Price of site is $90.
Install it your-self kit is $10.
Scattergun will install for $25 on a bead site barrel.
Scattergun will install for $45 on a rifle site barrel (includes refinishing,
pakerizing only).
Scattergun Technologies
P.O. Box 24517
Nashville, TN. 37202
PH: 615-254-1441
FAX: 616-254-1449