XS Express makes an aperture sight that fits the Rossi 1892 and the Winchester 94 angle eject. It mounts with one screw on either side of the bolt letting the bolt move back and forth underneath it. There's not a lot of metal there on the 1892 so drilling and tapping must to be very precise with the action apart and in a solid jig. I am in the process of having this done to my Rossi 454 by the Steve Young aka "the 1892 specialist". Its not a cheap installation however its the only way I'll be able to take advantage of this rifle's handiness.
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