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You need the proper delta ring and front cap for the RIS. The front cap requires a screw that screws into the front sight.
I had the same problem, with the turning. You need to tighten the barrel nut located infront of the delta ring when placed on to stop barrel movements.
As for the turning of the handguard, you would need to require to get shims for the barrel to get your delta ring 'nut' into place.
It's pretty hard to explain for me, it depends on what you bought, and what came with it.
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