So my assumption is correct then that the moderator IS screwed on to the end cap? And I removed the end cap? I’m thinking that I need to get the end cap separated from the moderator before I glue the end cap back in place .
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You are correct, the only two grub screws are the two in the rear of the shroud. The shroud end cap is not threaded, as the carbon fiber shroud is not threading friendly. It's glued on. If yours has come off, just rough it up a little with file or sandpaper and use some two-part epoxy to attach it. Mine came off the second time I shot the rifle, flew right off with the Donny silencer attached! Luckily nothing was damaged.