Charles Kerns
Copper BB
Five-thirty-five's have a barrel nut that screws into the end of the magazine tube. The 535 tube can not be extended. The only true night sites are starlight or thermal. Thermal's should be left to the military because thermal signatures can be misinterpreted.Just bought a 535 tactical and want to know if the Choate (or any other brand) extended mag tube for the 835 will fit.Also,does any one make night sights for it,preferably a ghost ring?