For someone who can't, shouldn't, or won't remove the castle nut, the Tango Down PR4 is the A-answer IMO.
For the front, there are options to mount to the top rail, and options to mount to the side. IME those that limit rotation, and do it at stops 45* to the bore (as opposed to inline with the bore and 90* to it) are best for the forward mount. One such that attaches to the top rail and that I have had good luck with is the Viking Tactics.


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You can check the review in the Tactical Gear sub forum, 


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