The rra nm detachable carry handle is the only one that has a rear sight that tracks true, but its not cheap.
To properly attach anything to a picatinny rail you have to push the mount forward (toward the muzzle) tight against the rail hold pressure on the mount and tighten it.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...