"Spark II - Bead replacement sight 6-48 fits Remington, Ithaca, SKB field guns 3-56 fits Browning Citori target, Benelli, Beretta, Ruger, and Winchester shotguns, 5-40 fits Mossberg, 3mm x .5 fit Browning Gold, 3mm x .6 fits Browning Citori Field model and BPS shotguns. Available in either red or green. Installation: Always make sure gun is unloaded and the chamber(s) are empty. With barrel pointed in a safe direction, remove the factory bead by unscrewing counter-clockwise. (Caution: some Remington shotguns have press-fit beads. If you cannot identify this on your gun we reccomend a gunsmith.) Determine the correct thread size by matching the thread pattern and diameter to the factory bead. With the correct threaded post removed from the sight base apply a small amount of thread locker to the end that will thread into the rib and screw the post into the rib and allow it to set up for about 2 hours. With the post installed in the rib, screw the sight onto the post and note where the viewing end is aligned. (NOTE: The LitePipe is not removable). If the sight is not aligned, then remove the sight form the post and place a piece of medium grit Emory cloth on a flat surface. Hold the sight and lightly sand the bottome of the sight base. This will allow the sight to index the viewing end to the correct position. Lightly sand the bottom of the sight base and then thread back onto the the post to check progress and continue as necessary. Once sight is almos|Spark II - This sight features the sight base and 5 interchangeable threads to accomodate most shotgun brands.|Export of this product outside of the United States of America is not allowed and is controlled by the US Department of State"