receiver sight.........
No, this one is drilled and tapped into the receiver with two 6-48 screws.
There is clearance for the cover although I may "relieve" mine some more to protect the sight from any lateral "impact".
For disassembly of the rifle , the sight unlocks from the base for quick removal.
Regarding sight picture, I similated the mounting while sighting and it appears that it is slightly higher than the std rear sight's position. The front sight would need to be raised some, but there is a clear focus of the front post...kewl....:^).
I look forward to seeing what a 28" sight radius will do!