RB2 are relatively late so near enough. If it looks right probably is. Some modern Hawk? just look wrong. Can use the Sportmatch Airsporter specific reach back mount.
Parallax can be an issue at x9 for 25m. Some non parallax scopes can be reparralaxed, but its scary finding out as its moving the front lens out but a few turns. Once found leave it. Sme don't have enough adjustment, others hard to shift, but if they can its a big plus. I've had mixed results so some still have to be shot at x6.