A lightened slide on a 9mm pistol in combination with a 960 Rowland conversion could be an "interesting" combination. And not in the good sense of "interesting".
I would recommend talking to Rowland about the advisability of such a course of action before spending too much money on it.
The Glock action (and other similar locked breech recoil operated pistol actions) balances slide/barrel momentum with bullet momentum. A high-velocity, heavy bullet load will increase bullet momentum significantly. That, in turn, combined with a lightened slide will increase slide velocity two ways. Higher momentum imparted by the heavier & faster bullet and less slide/barrel mass on the other side of the equation.
Most guns work best (and last best) in a fairly narrow range of slide velocities. Too low and malfunctions become an issue. Too high can cause both malfunctions and a significant decrease in service life--even potentially dangerous situations.
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