Yes, this comes with all the same pieces as if purchased separately. Early versions of each did not have a QD mount, but current versions all come with QD mounts.
No, the red dot does not, but the magnifier does.
Considering the overall length is 4.2in you should have enough room.
The total wieght is 12.5oz
The mount is not listed as included in the features section or package contents where it would be listed as included.
This will work fine, but your probably better off just getting a red dot and not the magnifier.
Made in USA.
True co-witness QR mount and low mount included
Yes the magnifier will flip to the side.
You would install each piece separately. You can keep them as close together as you'd like; however, you need to leave enough space between the magnifier and the dot in order to be able to flip the magnifier to the right. Being able to flip the magnifier to the left will cost you an additional $60 for the spacers. The magnifier has a screw on the bottom. For some God unknown reason, some engineer decided to place this screw in a position so that it interferes with the mount when you try to set the magnifier up to flip to the left.