There is a way of accurising these things with a new bushing without affecting reliability.

The new bushing would be fitted in the usual way, and have minimal play between barrel and bushing. Then the barrel portion behind the bushing should be turned down to taper away from the back of the bushing for 1/2" or so, then turned down parallel to the bore so that the barrel diameter from the taper to the barrel hood is a few thou less than the bushing internal diameter.

Because the barrel is attached to the frame, it will not flop about during the recoil cycle, and the slide will not drag on the barrel. However, when in battery, the close fit bushing will do it's job and improve accuracy greatly.

The other option is to simply fit a dot sight on a frame mounted scope mount. That way the slide to barrel relationship will have no bearing on accuracy.