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some uppers such as your Mega don't have clearance for a DD RISII / Lite style forend
Here is a Sun Devil upper that won't allow 4 of 6 to be used !
I personally wouldn't use only 4 of the 6 to secure the forend so I would turn down the head of the socket head cap screw on a lathe and use a small washer under the head
Great looking build. Couple of questions, are there any retailers for MEGA or ARFCOM in Canada? Why the "B.A.D" lever when you have an ambi bolt release built into the lower? Possibly for the locking bolt to rear feature?