We have 2 Rossi's. Both R92. One is a .357, the other is .45 Colt. Both have issues with the ramp for the rear sight not staying in place. Apparently the recoil is causing the ramp to move forward, which then lowers the rear sight. Other than gluing the ramp to the barrel, what other remedies might there be? We use these rifles for cowboy action shooting. The loads are very mild. 5.5 grains of Unique under a 158 grain bullet for the .357, and 8.5 grains of Unique under a 200 grain bullet for the .45.