Tacticool has some options that don’t leave the gap. For my own rifles it have used the cheepo free float tubes that slip over a long round nut then attach with six socket headed screws. None of the factory screw holes lined up when the tube was butted to the receiver so I drilled and tapped new holes in the correct place. Even after cutting the lugs off of the receiver, I still had to file a notch in the tube to allow zero gap. Of course I had to use the Tacticool adapter nut to start with. Tacticool didn’t offer their free float tubes when I bought my rifles or I would have used them.
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