Just got a used one in 22lr/20 ga.

Anyone recommend a peep sight? I think there are aperture sights that fit the grooves for .22 rimfires, but am wondering if they stay put when the 20 ga barrel is fired? Any experience with this?

Haven't had a chance to take the gun apart, but wondering if the trigger is able to be stoned or a spring changed to reduce the pull?

Any experienced input would be helpful. Thanks