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The handguards rails are compensated for the slope.
What holds the guard collar (the round piece between the sight and the handguards) is the triangle sight.
What holds the triangle sight in place is a pair of pins that mount in notches under the barrel.
You will either have to redo the notches in your barrel, or glue it in place with a good adhesive, like epoxy.
Or buy a new front end with RIS rails.
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